{"id":14798,"date":"2026-02-03T21:01:08","date_gmt":"2026-02-03T12:01:08","guid":{"rendered":"https:\/\/m365jp.net\/?p=14798"},"modified":"2026-02-03T21:02:32","modified_gmt":"2026-02-03T12:02:32","slug":"servicedegradation-ex1225888-exchange-online-admins-may-be-unable-to-complete-mailbox-migrations-in-exchange-online-2","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-02-03-servicedegradation-ex1225888-exchange-online-admins-may-be-unable-to-complete-mailbox-migrations-in-exchange-online-2","title":{"rendered":"[serviceDegradation] EX1225888 | Exchange Online | Admins may be unable to complete mailbox migrations in Exchange Online"},"content":{"rendered":"
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EX1225888 | Exchange Online | Admins may be unable to complete 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 may be unable to complete mailbox migrations in Exchange Online.<\/td>\n<\/tr>\n
Last Updated<\/th>\n02\/03\/2026 11:24:13<\/td>\n<\/tr>\n
Start Time<\/th>\n02\/02\/2026 04:52:11<\/td>\n<\/tr>\n
End Time<\/th>\n<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Admins may be unable to complete mailbox migrations in Exchange Online<\/p>\n

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

More info: This issue only affects multi-geo tenants.<\/p>\n

Current status: We\u2019ve disabled a setting to mitigate impact but this hasn’t resolved the issue. We’re analyzing fresh HTTP Archive format (HAR) files to determine why impact still persists.<\/p>\n

Scope of impact: Multi-geo admins may be unable to complete mailbox migrations in Exchange Online. This information may be updated as our investigation continues.<\/p>\n

Root cause: A recent service configuration change, intended to optimize how requests are routed within the service, is resulting in impact.<\/p>\n

Next update by: Tuesday, February 3, 2026, at 1:30 PM UTC<\/td>\n<\/tr>\n

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