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Is a Nasty Microsoft 365 Bug Stopping Your App Install? Get the Definitive Guide to a Successful Installation.
If you tried to install Microsoft 365 apps on your Windows computer on or after November 17, 2025, you might have run into an error. The installation may fail to complete, leaving you without the apps you need. You are not alone in this; Microsoft has confirmed there is a widespread service issue.
This problem is officially tracked under the reference ID OP1186186.
Who is Affected?
Microsoft has specified that the issue directly impacts users trying to install two recent versions of the desktop apps.
- Version 2508 (Build 19127.20358)
- Version 2507 (Build 19029.20294)
However, the problem could potentially affect anyone attempting a new installation of Microsoft 365 on a Windows device during this time.
The Cause of the Installation Error
The problem is caused by a mistake in a new update. Microsoft released new code meant to handle how you sign in to your account. This new code contains a misconfiguration, or a simple error, that incorrectly blocks the apps from installing on your computer. It is not a problem with your device or your account.
What Microsoft is Doing to Fix It
Microsoft’s engineering team is actively working on a solution. They have prepared a fix and are in the process of deploying it. However, the company noted that distributing this fix is taking more time than they originally planned.
The solution is expected to be included in the next scheduled update for Microsoft 365. The company is monitoring the situation closely to provide a clear timeline for when the problem will be fully resolved.
What You Can Do Now
While you wait for the official fix, you cannot directly solve the installation error yourself. However, you can use these temporary workarounds to stay productive.
- Use the Web Apps: You can access web-based versions of Word, Excel, PowerPoint, and Outlook through your browser at Office.com. These versions are not affected by the installation issue.
- Keep Checking for Updates: Since the fix will arrive in a future update, check for new software versions regularly in the coming days.
- Pause Planned Installations: If your business was planning to roll out new installations of Microsoft 365, it is best to postpone them until Microsoft confirms the issue is resolved.