EX1148496: Exchange Online Service Health Incident

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Sep 6, 2025, 4:34:34 AMSep 6
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Admins may see accepted domains not provisioning in Exchange Online after migration.                                                                                                                                                                                                                        
Microsoft

Admins may see accepted domains not provisioning in Exchange Online after migration

ID: EX1148496

Issue type: Incident

Status

Service Degradation

Impacted services

Exchange Online

Details

Title: Admins may see accepted domains not provisioning in Exchange Online after migration

User impact: Admins may see accepted domains not provisioning in Exchange Online after migration.

More info: Users whose mailboxes are hosted on affected domains may be unable to send or receive email messages until the issue is resolved and the domains are successfully provisioned.

Current status: We've expanded the scope of this communication and amended the Title, User impact, and Scope of impact sections accordingly. We identified that a recent update to improve the provisioning and deprovisioning actions in Exchange Online is causing some previously accepted domains to not provision as expected after migration. We're developing a fix to restore the functionality and repair any domains that are affected during the time of impact. We anticipate having an update on the fix progress by the next scheduled update time.

Scope of impact: This issue may potentially impact any admins performing migrations with accepted domains.

Start time: Wednesday, September 3, 2025, at 12:00 AM UTC

Root cause: A recent update to improve the provisioning and deprovisioning actions in Exchange Online is causing some previously accepted domains to not provision as expected after migration.

Next update by: Saturday, September 6, 2025, at 9:30 AM UTC

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