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Nawidahmad's avatar
Nawidahmad
Copper Contributor
Feb 16, 2024

Error code: CAA50021 when trying to login to office 365

Hello experts, One of my end users is unable to log in to Office 365 on her laptop, although she can log in on her desktop, via the web, and in the admin account of the laptop. When attempting to lo...
office 365
JDHenty's avatar
JDHenty
Copper Contributor
Apr 04, 2024

Nawidahmad 

I tried everything. This worked 1st time for me:

Remove Office credentials

  1. From Start, type credential manager, and then select Credential Manager from the search results.
  2. Select Windows credentials.
  3. If there are any credentials for MicrosoftOffice16, select the arrow next to them and then select Remove.
  4. Close Credential Manager.
  5. From Start, select Settings (the gear icon) > Accounts > Access work or school.
  6. If the account you use to sign in to office.com is listed there, but it isn’t the account you use to sign in to Windows, select it, and then select Disconnect.
  7. Restart the device and try to activate Microsoft 365 again.

This is the link:
https://admin.microsoft.com/Concierge/RedirectToArticle?uri=https%3A%2F%2Flearn.microsoft.com%2Fen-us%2Foffice%2Ftroubleshoot%2Factivation%2Factivation-error-0xcaa50021&solutionType=BCQRSolution&title=Microsoft%20365%20Apps%20activation%20error%200xCAA50021&clientAppName=SupportCentralSearch 

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