Issues with Creating Mailboxes in Microsoft 365?

September 21, 2025 3 answers
Asked by ChillPanda42
Is anyone else experiencing trouble creating mailboxes in Microsoft 365? I set up a user account a few hours ago, but when I returned to check, it still shows "We are preparing a mailbox for the user." I can see the account in Azure, which indicates that it was created, but it's not appearing in Exchange. I used the Microsoft Business Standard license for this account.

Answers

AdminWhisperer
This kind of delay happens sometimes, but usually itโ€™s quick. Right now, though, it seems like thereโ€™s an ongoing outage affecting many. Itโ€™s not just a normal wait time.

TechNinja: True, normally thereโ€™s just a minor delay, but waiting this long isnโ€™t usual!

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TechGuru99
Thereโ€™s actually an advisory out (EX1157370) regarding this issue. Some admins are currently unable to provision new mailboxes in Exchange Online. It seems like they're reviewing the situation to find a fix, but it's affecting quite a few users right now. You can check the service health for updates!

CuriousCat88: I heard they reverted a config change, so that might be causing the delays. It just hit our tenant a little while ago!

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UserTroubleshooter
Iโ€™m in the EU, and Iโ€™m seeing the same thing. Users are created and licensed in EntraID, but their mailboxes arenโ€™t showing up in Exchange Online. Really frustrating!

SlightlyAnnoyed: Right? It drives me nuts too!

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