{"id":15974,"date":"2026-04-17T01:01:09","date_gmt":"2026-04-16T16:01:09","guid":{"rendered":"https:\/\/m365jp.net\/?p=15974"},"modified":"2026-04-17T01:01:42","modified_gmt":"2026-04-16T16:01:42","slug":"servicedegradation-ex1280763-exchange-online-admins-are-unable-to-progress-mailbox-migrations-in-exchange-online","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-04-17-servicedegradation-ex1280763-exchange-online-admins-are-unable-to-progress-mailbox-migrations-in-exchange-online","title":{"rendered":"[serviceDegradation] EX1280763 | Exchange Online | Admins are unable to progress mailbox migrations in Exchange Online"},"content":{"rendered":"
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EX1280763 | Exchange Online | Admins are unable to progress mailbox migrations in Exchange Online<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n\n\n\n\n\n\n\n\n\n
Status<\/th>\nserviceDegradation<\/td>\n<\/tr>\n
Classification<\/th>\nadvisory<\/td>\n<\/tr>\n
User Impact<\/th>\nAdmins are unable to progress mailbox migrations in Exchange Online.<\/td>\n<\/tr>\n
Last Updated<\/th>\n04\/16\/2026 15:36:05<\/td>\n<\/tr>\n
Start Time<\/th>\n04\/15\/2026 08:36:58<\/td>\n<\/tr>\n
End Time<\/th>\n<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Admins may be unable to progress mailbox migrations in Exchange Online<\/p>\n

User impact: Admins may be unable to progress mailbox migrations in Exchange Online.<\/p>\n

More info: All mailbox migrations from on-premises to Exchange Online and tenant-to-tenant remain in a syncing state.<\/p>\n

Current status: We’ve begun deploying our fix to revert the offending service update to our internal test environment to validate whether it resolves the issue prior to broad deployment. We anticipate our validations will complete, and broad deployment initiated by our next scheduled communications update. We’ll continue reviewing potential short-term mitigation options, but our testing thus far hasn’t revealed any viable actions besides the reversion.<\/p>\n

Scope of impact: All admins attempting mailbox migrations from on-premises to Exchange Online are impacted. This information may be updated as our investigation continues.<\/p>\n

Root cause: A recent service-side update introduced an issue that is causing migration jobs to fail, resulting in impact.<\/p>\n

Next update by: Monday, April 20, 2026, at 6:00 PM UTC<\/td>\n<\/tr>\n

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