{"id":16024,"date":"2026-04-21T03:01:33","date_gmt":"2026-04-20T18:01:33","guid":{"rendered":"https:\/\/m365jp.net\/?p=16024"},"modified":"2026-04-21T03:01:43","modified_gmt":"2026-04-20T18:01:43","slug":"servicedegradation-ex1280763-exchange-online-admins-are-unable-to-progress-mailbox-migrations-in-exchange-online-3","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-04-21-servicedegradation-ex1280763-exchange-online-admins-are-unable-to-progress-mailbox-migrations-in-exchange-online-3","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\/20\/2026 17:32:25<\/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 are unable to progress mailbox migrations in Exchange Online<\/p>\n

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

More info: All mailbox onboarding and offboarding scenarios in Exchange Online, including Tenant to Tenant migrations remain in a syncing state.<\/p>\n

Current status: We confirmed through internal testing in our internal environments the effectiveness of the fix and have begun broad deployment. The deployment is currently at 29% and progressing. We’ll continue to monitor the deployment of the fix and provide additional status at next communication time.<\/p>\n

Scope of impact: All admins attempting mailbox migrations into or out of 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: Wednesday, April 22, 2026, at 7:00 PM UTC<\/td>\n<\/tr>\n

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