Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center

Title: Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center User impact: Admins may have been unable to perform actions involving DNS records within the Exchange admin center. More info: This issue may have impacted admins attempting to perform any actions involving DNS records within the Exchange admin center, such as provisioning new domains or mailboxes, accessing the Exchange admin center, or changing domains from IPv6 to IPv4. Final status: We've processed the backlog of accumulated requests and confirmed through monitoring service health telemetry that the impact has been remediated. Scope of impact: Admins attempting to perform actions involving DNS records within the Exchange admin center may have been impacted. Start time: Wednesday, June 17, 2026, at 6:00 AM UTC End time: Saturday, June 20, 2026, at 4:00 PM UTC Root cause: A recently enabled provisioning feature introduced a large number of synchronization divergences, resulting in repeated cmdlet executions that was causing resource contention and impact. Next steps: - We're reviewing the offending provisioning feature to determine why it introduced a large number of synchronization divergences once implemented, so that we can prevent similar issues from occurring in the future. This is the final update for the event.

Title: Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center User impact: Admins may be unable to perform actions involving DNS records within the Exchange admin center. More info: This issue may impact admins attempting to perform any actions involving DNS records within the Exchange admin center, such as provisioning new domains or mailboxes, accessing the Exchange admin center, or changing domains from IPv6 to IPv4. Current status: Our efforts to monitor service health telemetry to validate that the backlog of accumulated requests has fully processed is ongoing. We expect to be able to provide confirmation that the issue is resolved by our next scheduled update. Scope of impact: Admins attempting to perform actions involving DNS records within the Exchange admin center may be impacted. This information may be updated as our investigation continues. Start time: Wednesday, June 17, 2026, at 6:00 AM UTC Root cause: A recently enabled provisioning feature introduced a large number of synchronization divergences, resulting in repeated cmdlet executions that's causing resource contention and impact. Next update by: Saturday, June 20, 2026, at 6:00 PM UTC

Title: Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center User impact: Admins may be unable to perform actions involving DNS records within the Exchange admin center. More info: This issue may impact admins attempting to perform any actions involving DNS records within the Exchange admin center, such as provisioning new domains or mailboxes, accessing the Exchange admin center, or changing domains from IPv6 to IPv4. Current status: We’re continuing to monitor service health telemetry to validate that the backlog of accumulated requests has fully processed. Service health remains stable following the disablement of the offending provisioning feature and we’re maintaining an extended monitoring period to confirm sustained service stability and ensure no further impact is observed before concluding our mitigation efforts. Scope of impact: Admins attempting to perform actions involving DNS records within the Exchange admin center may be impacted. This information may be updated as our investigation continues. Start time: Wednesday, June 17, 2026, at 6:00 AM UTC Root cause: A recently enabled provisioning feature introduced a large number of synchronization divergences, resulting in repeated cmdlet executions that's causing resource contention and impact. Next update by: Saturday, June 20, 2026, at 2:30 PM UTC

Title: Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center User impact: Admins may be unable to perform actions involving DNS records within the Exchange admin center. More info: This issue may impact admins attempting to perform any actions involving DNS records within the Exchange admin center, such as provisioning new domains or mailboxes, accessing the Exchange admin center, or changing domains from IPv6 to IPv4. Current status: We've confirmed that disabling the offending provisioning feature successfully helped to stabilize the affected service infrastructure and alleviate impact. We're continuing to monitor service health telemetry in order to validate that the backlog of accumulated requests fully processes, which we anticipate will complete and remediate all impact by our next scheduled update. Scope of impact: Admins attempting to perform actions involving DNS records within the Exchange admin center may be impacted. This information may be updated as our investigation continues. Start time: Wednesday, June 17, 2026, at 6:00 AM UTC Root cause: A recently enabled provisioning feature introduced a large number of synchronization divergences, resulting in repeated cmdlet executions that's causing resource contention and impact. Next update by: Saturday, June 20, 2026, at 9:00 AM UTC

Title: Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center User impact: Admins may be unable to perform actions involving DNS records within the Exchange admin center. More info: This issue may impact admins attempting to perform any actions involving DNS records within the Exchange admin center, such as provisioning new domains or mailboxes, accessing the Exchange admin center, or changing domains from IPv6 to IPv4. Current status: We've continuing to disable the offending provisioning feature and clear the backlog of accumulated requests, and we anticipate both these processes will complete and remediate the impact by our next scheduled communications update. Scope of impact: Admins attempting to perform actions involving DNS records within the Exchange admin center may be impacted. This information may be updated as our investigation continues. Start time: Wednesday, June 17, 2026, at 6:00 AM UTC Estimated time to resolve: We anticipate the offending provisioning feature will be disabled and the backlog of accumulated requests processed by Friday, June 19, 2026, at 9:30 PM UTC. Root cause: A recently enabled provisioning feature introduced a large number of synchronization divergences, resulting in repeated cmdlet executions that's causing resource contention and impact. Next update by: Friday, June 19, 2026, at 9:30 PM UTC

Title: Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center User impact: Admins may be unable to perform actions involving DNS records within the Exchange admin center. More info: This issue may impact admins attempting to perform any actions involving DNS records within the Exchange admin center, such as provisioning new domains or mailboxes, accessing the Exchange admin center, or changing domains from IPv6 to IPv4. Current status: We’re continuing with our efforts to disable the provisioning feature responsible for generating additional synchronization divergences and to remove the existing backlog. We expect to be able to provide a remediation timeline by our next scheduled update. Scope of impact: Admins attempting to perform actions involving DNS records within the Exchange admin center may be impacted. This information may be updated as our investigation continues. Start time: Wednesday, June 17, 2026, at 6:00 AM UTC Root cause: A recently enabled provisioning feature introduced a large number of synchronization divergences, resulting in repeated cmdlet executions that's causing resource contention and impact. Next update by: Friday, June 19, 2026, at 7:00 PM UTC

Title: Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center User impact: Admins may be unable to perform actions involving DNS records within the Exchange admin center. More info: This issue may impact admins attempting to perform any actions involving DNS records within the Exchange admin center, such as provisioning new domains or mailboxes, accessing the Exchange admin center, or changing domains from IPv6 to IPv4. Current status: We’re progressing with our efforts to disable the provisioning feature responsible for generating additional synchronization divergences and are continuing cleanup efforts to remove the existing backlog. In parallel, we’re implementing processing changes to help reduce system load and improve throughput, as we work to restore affected provisioning operations to expected service levels. Scope of impact: Admins attempting to perform actions involving DNS records within the Exchange admin center may be impacted. This information may be updated as our investigation continues. Start time: Wednesday, June 17, 2026, at 6:00 AM UTC Root cause: A recently enabled provisioning feature introduced a large number of synchronization divergences, resulting in repeated cmdlet executions that's causing resource contention and impact. Next update by: Friday, June 19, 2026, at 2:30 PM UTC

Title: Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center User impact: Admins may be unable to perform actions involving DNS records within the Exchange admin center. More info: This issue may impact admins attempting to perform any actions involving DNS records within the Exchange admin center, such as provisioning new domains or mailboxes, accessing the Exchange admin center, or changing domains from IPv6 to IPv4. Current status: We've updated the Title, User impact, More info, and Scope of impact sections as we've determined that any actions involving DNS records within the Exchange admin center may be impacted. We're continuing to perform cleanup efforts and remove existing divergences to return the service to expected functionality. Scope of impact: Admins attempting to perform actions involving DNS records within the Exchange admin center may be impacted. This information may be updated as our investigation continues. Start time: Wednesday, June 17, 2026, at 6:00 AM UTC Root cause: A recently enabled provisioning feature introduced a large number of synchronization divergences, resulting in repeated cmdlet executions that's causing resource contention and impact. Next update by: Friday, June 19, 2026, at 8:30 AM UTC

Title: Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center User impact: Admins may be unable to perform actions involving DNS records within the Exchange admin center. More info: Admins may receive the following error when attempting to change their domain from IPv6 to IPv4: “WARNING: Failed to update DNS record for domain. Error: Too many operations are requested. Current operation is throttled.” Current status: We've identified that a recently enabled provisioning feature introduced a large number of synchronization divergences, resulting in repeated cmdlet executions that prevented some Exchange Online IPv6 to IPv4 domain changes from completing successfully. To remediate this issue and prevent additional synchronization divergences from being created, we've disabled the affected provisioning feature and are performing cleanup efforts to remove the existing divergences for full remediation. Scope of impact: Admins attempting to perform actions involving DNS records within the Exchange admin center may be impacted. This information may be updated as our investigation continues. Start time: Wednesday, June 17, 2026, at 6:00 AM UTC Root cause: A recently enabled provisioning feature introduced a large number of synchronization divergences, resulting in repeated cmdlet executions that prevented some Exchange Online IPv6 to IPv4 domain changes from completing successfully. Next update by: Friday, June 19, 2026, at 8:30 AM UTC

Title: Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center User impact: Admins may be unable to perform actions involving DNS records within the Exchange admin center. More info: Admins may receive the following error when attempting to change their domain from IPv6 to IPv4: “WARNING: Failed to update DNS record for domain. Error: Too many operations are requested. Current operation is throttled.” Current status: More time is needed to investigate the Domain Name System (DNS) logs to isolate the source of impact. We aim to have an updated status by our next scheduled update. Scope of impact: Admins attempting to perform actions involving DNS records within the Exchange admin center may be impacted. This information may be updated as our investigation continues. Start time: Wednesday, June 17, 2026, at 8:13 AM UTC Next update by: Thursday, June 18, 2026, at 8:00 PM UTC

Title: Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center User impact: Admins may be unable to perform actions involving DNS records within the Exchange admin center. More info: Admins may receive the following error when attempting to change their domain from IPv6 to IPv4: “WARNING: Failed to update DNS record for domain. Error: Too many operations are requested. Current operation is throttled.” Current status: We're furthering our analysis on the Domain Name System (DNS) logs to isolate the source of traffic to help determine a path towards remediation. Scope of impact: Admins attempting to perform actions involving DNS records within the Exchange admin center may be impacted. This information may be updated as our investigation continues. Next update by: Thursday, June 18, 2026, at 3:00 AM UTC

Title: Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center User impact: Admins may be unable to perform actions involving DNS records within the Exchange admin center. More info: Admins may receive the following error when attempting to change their domain from IPv6 to IPv4: “WARNING: Failed to update DNS record for domain. Error: Too many operations are requested. Current operation is throttled.” Current status: We've identified that unusually high traffic to the affected infrastructure is preventing the cmdlet used to change the domain from IPv6 to IPv4 from working as expected. We're reviewing Domain Name System (DNS) logs to determine the source of this traffic, which may help us determine a strategy that remediates impact. Scope of impact: Admins attempting to perform actions involving DNS records within the Exchange admin center may be impacted. This information may be updated as our investigation continues. Next update by: Thursday, June 18, 2026, at 1:00 AM UTC

Title: Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center User impact: Admins may be unable to perform actions involving DNS records within the Exchange admin center. More info: Admins may receive the following error when attempting to change their domain from IPv6 to IPv4: “WARNING: Failed to update DNS record for domain. Error: Too many operations are requested. Current operation is throttled.” Current status: We're continuing to review data, which includes error details, to determine the root cause and a strategy that remediates impact. Scope of impact: Admins attempting to perform actions involving DNS records within the Exchange admin center may be impacted. This information may be updated as our investigation continues. Next update by: Wednesday, June 17, 2026, at 11:00 PM UTC

Title: Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center User impact: Admins may be unable to perform actions involving DNS records within the Exchange admin center. More info: Admins may receive the following error when attempting to change their domain from IPv6 to IPv4: “WARNING: Failed to update DNS record for domain. Error: Too many operations are requested. Current operation is throttled.” Current status: We're reviewing data to determine why admins may be unable to change their domain from IPv6 to IPv4. Scope of impact: Admins attempting to perform actions involving DNS records within the Exchange admin center may be impacted. This information may be updated as our investigation continues. Next update by: Wednesday, June 17, 2026, at 9:00 PM UTC

Title: Admins may be unable to perform actions involving Domain Name System (DNS) records within the Exchange admin center User impact: Admins may be unable to perform actions involving DNS records within the Exchange admin center. More info: Admins may receive the following error when attempting to change their domain from IPV6 to IPV4: “WARNING: Failed to update DNS record for domain. Error: Too many operations are requested. Current operation is throttled.” Current status: We're investigating a potential issue with Exchange Online and checking for impact to your organization. We'll provide an update within 30 minutes.