Some admins may be unable to perform tenant to tenant migrations and offboarding moves in the Exchange admin center

Title: Some admins may be unable to perform tenant to tenant migrations and offboarding moves in the Exchange admin center User impact: Admins may have been unable to perform tenant to tenant migrations and offboarding moves in the Exchange admin center. More info: While we work on developing a long-term solution, admins may have been able to use PowerShell for the affected migrations and moves with the following cmdlet against the affected mailboxes: Set-MoveRequest "user@yourdomain.com" -SkipMoving FolderRestrictions Next, the tenant admin may have resume the move request using the cmdlet: Resume-MoveRequest "user@yourdomain.com" This would allow the affected move jobs to continue to make progress. Admins may have been able to run the following PowerShell cmdlets sequentially for migration batches: Set-MigrationBatch batchname -SkipMoving FolderRestrictions Start-MigrationBatch "BatchName" Admins attempting to complete a tenant-to-tenant migration or an offboarding move in Exchange Online would have been returned the following error "PropTagToPropertyDefinitionConversionException" Final status: Our fix has completed deployment and we've confirmed through monitoring service health telemetry as well as through testing with a subset of affected admins that the impact has been remediated. Scope of impact: Some admins attempting to perform tenant to tenant migrations and offboarding moves in the Exchange admin center may have been affected. Start time: Saturday, February 14, 2026, at 12:48 AM UTC End time: Friday, April 3, 2026, at 7:59 PM UTC Root cause: A change introduced a code regression to Mailbox Replication Service (MRS), which causes intermittent failures for tenant-to-tenant migration actions or offboarding moves as the property tags needed to complete the request were not being properly configured. Next steps: - We're investigating the impacting change to establish why the code regression wasn't addressed within our pre-deployment testing process. The results of the investigation will help us improve our update processes and help establish ways to improve the service. This is the final update for the event.

Title: Some admins may be unable to perform tenant to tenant migrations and offboarding moves in the Exchange admin center User impact: Admins may be unable to perform tenant to tenant migrations and offboarding moves in the Exchange admin center. More info: While we work on developing a long-term solution, admins may use PowerShell for the affected migrations and moves with the following cmdlet against the affected mailboxes: Set-MoveRequest "user@yourdomain.com" -SkipMoving FolderRestrictions Next, the tenant admin may resume the move request using the cmdlet: Resume-MoveRequest "user@yourdomain.com" This will allow the affected move jobs to continue to make progress. Admins may run the following PowerShell cmdlets sequentially for migration batches: Set-MigrationBatch batchname -SkipMoving FolderRestrictions Start-MigrationBatch "BatchName" Admins attempting to complete a tenant-to-tenant migration or an offboarding move in Exchange Online will be returned the following error "PropTagToPropertyDefinitionConversionException" Current status: The deployment of our fix isn't progressing as quickly as expected, which may delay our original estimated timeline for remediating the impact. We're expecting our solution will have completed over half of the necessary deployment by our next scheduled communication update, when we'll confirm the remaining timeline for remediating the impact. Scope of impact: Some admins attempting to perform tenant to tenant migrations and offboarding moves in the Exchange admin center may be affected. This information may be updated as our investigation continues. Root cause: A change introduced a code regression to Mailbox Replication Service (MRS), which causes intermittent failures for tenant-to-tenant migration actions or offboarding moves as the property tags needed to complete the request are not being properly configured. Next update by: Friday, April 3, 2026, at 9:30 PM UTC

Title: Some admins may be unable to perform tenant to tenant migrations and offboarding moves in the Exchange admin center User impact: Admins may be unable to perform tenant to tenant migrations and offboarding moves in the Exchange admin center. More info: While we work on developing a long-term solution, admins may use PowerShell for the affected migrations and moves with the following cmdlet against the affected mailboxes: Set-MoveRequest "user@yourdomain.com" -SkipMoving FolderRestrictions Next, the tenant admin may resume the move request using the cmdlet: Resume-MoveRequest "user@yourdomain.com" This will allow the affected move jobs to continue to make progress. Admins may run the following PowerShell cmdlets sequentially for migration batches: Set-MigrationBatch batchname -SkipMoving FolderRestrictions Start-MigrationBatch "BatchName" Admins attempting to complete a tenant-to-tenant migration or an offboarding move in Exchange Online will be returned the following error "PropTagToPropertyDefinitionConversionException" Current status: We've developed and deployed an updated fix to ensure that all tenant to tenant and offboarding moves are restored for admins in the Exchange Online admin center. We expect that this fix will have completely saturated all affected environments by Friday, April 3, 2026, and we'll continue monitoring this process as it progresses so that we’re able to provide any updates to this timeline as soon as they become available. Scope of impact: Some admins attempting to perform tenant to tenant migrations and offboarding moves in the Exchange admin center may be affected. This information may be updated as our investigation continues. Root cause: A change introduced a code regression to Mailbox Replication Service (MRS), which causes intermittent failures for tenant-to-tenant migration actions or offboarding moves as the property tags needed to complete the request are not being properly configured. Next update by: Thursday, March 26, 2026, at 9:30 PM UTC

Title: Some admins may be unable to perform tenant to tenant migrations and offboarding moves in the Exchange admin center User impact: Admins may be unable to perform tenant to tenant migrations and offboarding moves in the Exchange admin center. More info: While we work on developing a long-term solution, admins may use PowerShell for the affected migrations and moves with the following cmdlet against the affected mailboxes: Set-MoveRequest "user@yourdomain.com" -SkipMoving FolderRestrictions Next, the tenant admin may resume the move request using the cmdlet: Resume-MoveRequest "user@yourdomain.com" This will allow the affected move jobs to continue to make progress. Admins may run the following PowerShell cmdlets sequentially for migration batches: Set-MigrationBatch batchname -SkipMoving FolderRestrictions Start-MigrationBatch "BatchName" Admins attempting to complete a tenant-to-tenant migration or an offboarding move in Exchange Online will be returned the following error "PropTagToPropertyDefinitionConversionException" Current status: During the initial deployment of our solution into our internal validation environment, our testing determined that while it would address most of the problems admins are experiencing, it wouldn't resolve the problems for any non-signature moves, and thus not be viable for remediating the impact. We're developing a new solution to ensure that all tenant to tenant and offboarding moves are restored for admins in the Exchange Online admin center and expect more clarity into the timeline for its deployment by our next scheduled communication update. Scope of impact: Some admins attempting to perform tenant to tenant migrations and offboarding moves in the Exchange admin center may be affected. This information may be updated as our investigation continues. Root cause: A change introduced a code regression to Mailbox Replication Service (MRS), which causes intermittent failures for tenant-to-tenant migration actions or offboarding moves as the property tags needed to complete the request are not being properly configured. Next update by: Thursday, March 19, 2026, at 9:30 PM UTC

Title: Some admins may be unable to perform tenant to tenant migrations and offboarding moves in the Exchange admin center User impact: Admins may be unable to perform tenant to tenant migrations and offboarding moves in the Exchange admin center. More info: While we work on developing a long-term solution, admins may use PowerShell for the affected migrations and moves with the following cmdlet against the affected mailboxes: Set-MoveRequest "user@yourdomain.com" -SkipMoving FolderRestrictions Next, the tenant admin may resume the move request using the cmdlet: Resume-MoveRequest "user@yourdomain.com" This will allow the affected move jobs to continue to make progress. Admins may run the following PowerShell cmdlets sequentially for migration batches: Set-MigrationBatch batchname -SkipMoving FolderRestrictions Start-MigrationBatch "BatchName" Admins attempting to complete a tenant-to-tenant migration or an offboarding move in Exchange Online will be returned the following error "PropTagToPropertyDefinitionConversionException" Current status: We received a report of our previously communicated PowerShell cmdlet listed in the More info section not working as expected specifically for migration batches. We've updated that section with revised guidance and recommend admins review this updated information. Regarding the deployment status, we're continuing to monitor its progress, which may gradually provide relief to admins as it saturates the environment. Scope of impact: Some admins attempting to perform tenant to tenant migrations and offboarding moves in the Exchange admin center may be affected. This information may be updated as our investigation continues. Root cause: A change introduced a code regression to Mailbox Replication Service (MRS), which causes intermittent failures for tenant-to-tenant migration actions or offboarding moves as the property tags needed to complete the request are not being properly configured. Next update by: Monday, March 16, 2026, at 9:00 PM UTC

Title: Some admins may be unable to perform tenant to tenant migrations and offboarding moves in the Exchange admin center User impact: Admins may be unable to perform tenant to tenant migrations and offboarding moves in the Exchange admin center. More info: While we work on developing a long-term solution, admins may use PowerShell for the affected migrations and moves with the following cmdlet against the affected mailboxes: Set-MoveRequest "user@yourdomain.com" -SkipMoving FolderRestrictions The tenant admin may then resume the move request (Resume-MoveRequest "user@yourdomain.com") or simply resume the migration batch. This will allow the affected move jobs to continue to make progress. Admins attempting to complete a tenant-to-tenant migration or an offboarding move in Exchange Online will be returned the following error "PropTagToPropertyDefinitionConversionException" Current status: We're continuing to monitor as the deployment progresses, and we expect it may take a few weeks to be fully saturated. Users will experience remediation incrementally while the fix is deployed, and we'll aim to provide an update on the resolution timeline once available. Scope of impact: Some admins attempting to perform tenant to tenant migrations and offboarding moves in the Exchange admin center may be affected. This information may be updated as our investigation continues. Root cause: A change introduced a code regression to Mailbox Replication Service (MRS), which causes intermittent failures for tenant-to-tenant migration actions or offboarding moves as the property tags needed to complete the request are not being properly configured. Next update by: Monday, March 16, 2026, at 9:00 PM UTC

Title: Some admins may be unable to perform tenant to tenant migrations and offboarding moves in Exchange Online User impact: Admins may be unable to perform tenant to tenant migrations and offboarding moves in Exchange Online. More info: While we work on developing a long-term solution, admins may use PowerShell for the affected migrations and moves with the following cmdlet against the affected mailboxes: Set-MoveRequest "user@yourdomain.com" -SkipMoving FolderRestrictions The tenant admin may then resume the move request (Resume-MoveRequest "user@yourdomain.com") or simply resume the migration batch. This will allow the affected move jobs to continue to make progress. Admins attempting to complete a tenant-to-tenant migration or an offboarding move in Exchange Online will be returned the following error "PropTagToPropertyDefinitionConversionException" Current status: We've completed our final internal validations of our solution to address the code regression, and we've begun the deployment to the affected environment. We're monitoring its progress as we'll provide an estimated time for remediation as one becomes available. Scope of impact: Some admins attempting to perform tenant to tenant migrations and offboarding moves in Exchange Online may be affected. This information may be updated as our investigation continues. Root cause: A change introduced a code regression to Mailbox Replication Service (MRS), which causes intermittent failures for tenant-to-tenant migration actions or offboarding moves as the property tags needed to complete the request are not being properly configured. Next update by: Monday, March 9, 2026, at 10:00 PM UTC

Title: Some admins may be unable to perform tenant to tenant migrations and offboarding moves in Exchange Online User impact: Admins may be unable to perform tenant to tenant migrations and offboarding moves in Exchange Online. More info: While we work on developing a long-term solution, admins may use PowerShell for the affected migrations and moves with the following cmdlet against the affected mailboxes: Set-MoveRequest "user@yourdomain.com" -SkipMoving FolderRestrictions The tenant admin may then resume the move request (Resume-MoveRequest "user@yourdomain.com") or simply resume the migration batch. This will allow the affected move jobs to continue to make progress. Admins attempting to complete a tenant-to-tenant migration or an offboarding move in Exchange Online will be returned the following error "PropTagToPropertyDefinitionConversionException" Current status: Following our completed fix development, we've progressed to the internal validation stage of our mitigations so we can ensure that the fix addresses the problems admins are having with migrations and offboarding without introducing any unexpected problems to the service. We're expecting an estimated timeline for the deployment of our fix and the remediation of the impact will be available once our internal validations have completed. Scope of impact: Some admins attempting to perform tenant to tenant migrations and offboarding moves in Exchange Online may be affected. This information may be updated as our investigation continues. Root cause: A change introduced a code regression to Mailbox Replication Service (MRS), which causes intermittent failures for tenant-to-tenant migration actions or offboarding moves as the property tags needed to complete the request are not being properly configured. Next update by: Monday, March 2, 2026, at 10:00 PM UTC

Title: Some admins may be unable to perform tenant to tenant migrations and offboarding moves in Exchange Online User impact: Admins may be unable to perform tenant to tenant migrations and offboarding moves in Exchange Online. More info: While we work on developing a long-term solution, admins may use PowerShell for the affected migrations and moves with the following cmdlet against the affected mailboxes: Set-MoveRequest "user@yourdomain.com" -SkipMoving FolderRestrictions The tenant admin may then resume the move request (Resume-MoveRequest "user@yourdomain.com") or simply resume the migration batch. This will allow the affected move jobs to continue to make progress. Admins attempting to complete a tenant-to-tenant migration or an offboarding move in Exchange Online will be returned the following error "PropTagToPropertyDefinitionConversionException" Current status: We're in the final stages of the development of our solution to address the code regression and we're preparing to begin testing this fix to validate that it'll successfully remediate the impact. We'll provide a timeline for resolution as one becomes available. Scope of impact: Some admins attempting to perform tenant to tenant migrations and offboarding moves in Exchange Online may be affected. This information may be updated as our investigation continues. Root cause: A change introduced a code regression to Mailbox Replication Service (MRS), which causes intermittent failures for tenant-to-tenant migration actions or offboarding moves as the property tags needed to complete the request are not being properly configured. Next update by: Thursday, February 26, 2026, at 10:00 PM UTC

Title: Some admins may be unable to perform tenant to tenant migrations and offboarding moves in Exchange Online User impact: Admins may be unable to perform tenant to tenant migrations and offboarding moves in Exchange Online. More info: While we work on developing a long-term solution, admins may use PowerShell for the affected migrations and moves with the following cmdlet against the affected mailboxes: Set-MoveRequest "user@yourdomain.com" -SkipMoving FolderRestrictions The tenant admin may then resume the move request (Resume-MoveRequest "user@yourdomain.com") or simply resume the migration batch. This will allow the affected move jobs to continue to make progress. Admins attempting to complete a tenant-to-tenant migration or an offboarding move in Exchange Online will be returned the following error "PropTagToPropertyDefinitionConversionException" Current status: After analyzing backend settings and recent changes, we've isolated the offending change. This change introduced a code regression to Mailbox Replication Service (MRS), which causes intermittent failures for tenant-to-tenant migration actions or offboarding moves as the property tags needed to complete the request are not being properly configured. We're creating and validating a code fix to address the regression and we aim to provide updates as development progresses. Simultaneously, we've expanded communications to all potentially affected tenants to ensure all affected admins are receiving updates about this issue. Scope of impact: Some admins attempting to perform tenant to tenant migrations and offboarding moves in Exchange Online may be affected. This information may be updated as our investigation continues. Root cause: A change introduced a code regression to Mailbox Replication Service (MRS), which causes intermittent failures for tenant-to-tenant migration actions or offboarding moves as the property tags needed to complete the request are not being properly configured. Next update by: Friday, February 20, 2026, at 10:00 PM UTC

Title: Some admins may be unable to perform tenant to tenant migrations and offboarding moves in Exchange Online User impact: Admins may be unable to perform tenant to tenant migrations and offboarding moves in Exchange Online. More info: While we work on developing a long-term solution, admins may use PowerShell for the affected migrations and moves with the following cmdlet against the affected mailboxes: Set-MoveRequest "user@yourdomain.com" -SkipMoving FolderRestrictions The tenant admin may then resume the move request (Resume-MoveRequest "user@yourdomain.com") or simply resume the migration batch. This will allow the affected move jobs to continue to make progress. Current status: We've been made aware of an issue in which some admins may be unable to perform tenant to tenant migrations and offboarding moves in Exchange Online. We're reviewing backend settings and recent changes to identify the root cause and develop a long-term solution. In the meantime, admins can follow the steps listed in the More Info section of this communication to bypass the impact scenario. Scope of impact: Some admins attempting to perform tenant to tenant migrations and offboarding moves in Exchange Online may be affected. This information may be updated as our investigation continues. Next update by: Tuesday, February 17, 2026, at 10:00 PM UTC