Admins may be unable to provision some users’ Exchange Online mailboxes

Title: Admins may be unable to provision some users’ Exchange Online mailboxes User impact: Admins may have been unable to provision some users’ Exchange Online mailboxes. More info: Affected admins may have also been unable to access the Exchange admin center. Final status: We've validated that the backlogged provisioning requests fully processed and our service change implementation successfully remediated all impact for this issue. Scope of impact: Admins who attempted to provision some users' Exchange Online mailboxes or access the Exchange admin center may have been impacted by this event. Start time: Thursday, June 18, 2026, at 7:28 AM UTC End time: Friday, June 19, 2026, at 8:51 PM UTC Root cause: A separate service issue involving a data sync gap between Exchange Online and Microsoft Entra ID caused this issue and resulted in impact to admins' provisioning attempts. Next steps: - We're continuing to review how this data sync gap between Exchange Online and Microsoft Entra ID was introduced in order to improve our service reliability for admin provisioning requests and access to the Exchange admin center, and to avoid similar issues from occurring in the future. This is the final update for the event.

Title: Admins may be unable to provision some users’ Exchange Online mailboxes User impact: Admins may be unable to provision some users’ Exchange Online mailboxes. More info: Affected admins may also be unable to access the Exchange admin center. Current status: We've determined that a separate service issue involving a data sync gap between Exchange Online and Microsoft Entra ID is causing this issue and resulting in impact to admins' provisioning attempts. We're continuing to monitor the effectiveness of our service change implementation aimed at correcting this gap while the backlogged provisioning requests process. Scope of impact: Admins attempting to provision some users' Exchange Online mailboxes or access the Exchange admin center may be impacted by this event. Start time: Thursday, June 18, 2026, at 7:28 AM UTC Root cause: A separate service issue involving a data sync gap between Exchange Online and Microsoft Entra ID is causing this issue and resulting in impact to admins' provisioning attempts. Next update by: Saturday, June 20, 2026, at 5:30 AM UTC

Title: Admins can’t provision some users’ Exchange Online mailboxes User impact: Admins can’t provision some users’ Exchange Online mailboxes. Current status: We're progressing with our analysis of support and diagnostic data to determine the underlying cause of the issue. In parallel, we've implemented a service change that is expected to help mitigate the impact and are actively monitoring its effectiveness as affected provisioning requests continue to be processed. However, we're seeing positive signs, with some provisioning requests now completing successfully. We'll continue to monitor backlog reduction and work closely with your representatives to evaluate the effectiveness of the service change and confirm sustained improvement. Scope of impact: Impact is specific to admins attempting to provision mailboxes or access the Exchange admin center. Next update by: Friday, June 19, 2026, at 5:30 PM UTC

Title: Admins can’t provision some users’ Exchange Online mailboxes User impact: Admins can’t provision some users’ Exchange Online mailboxes. Current status: We’re continuing our analysis of support case details, as well as working with your representatives to obtain further contextual details of the impact scenario to help isolate the source of impact and formulate a mitigation plan. Scope of impact: Impact is specific to admins attempting to provision mailboxes or access the Exchange admin center. Next update by: Friday, June 19, 2026, at 12:00 PM UTC

Title: Admins can’t provision some users’ Exchange Online mailboxes User impact: Admins can’t provision some users’ Exchange Online mailboxes. Current status: We’re reviewing system logs to isolate the origin of this issue. Scope of impact: Your organization is affected by this event, and admins can’t provision some users’ Exchange Online mailboxes. This information may be updated as our investigation continues. Next update by: Friday, June 19, 2026, at 10:00 AM UTC

Title: Admins can’t provision some users’ mailboxes User impact: Admins can’t provision some users’ mailboxes. Current status: We're investigating a potential issue in which admins can’t provision some users’ mailboxes and checking for impact to your organization. We'll provide an update within 30 minutes.