Error code: CAA90063 when I attempt to login my Microsoft Outlook.

Sinetemba Fumbata 0 Reputation points
2025-03-26T06:03:29.9566667+00:00

I get this error message whenever I attempt to login my Microsoft Teams and Outlook.User's image

Outlook | Windows | Classic Outlook for Windows | For business
{count} votes

2 answers

Sort by: Most helpful
  1. Thannhauser, M. (Mike) 30 Reputation points
    2025-05-07T17:21:48.98+00:00

    @Sinetemba Fumbata , What i've tried is the following:

    Delete all the files under the folder c:\Users<User>\AppData\Local\Packages\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy\AC\TokenBroker\Account

    Then Reboot.

    This made everything work as normal for me again.

    Source: https://www.reddit.com/r/Office365/comments/xetxot/unresolvable_problem_on_signing_in_microsoft/

    4 people found this answer helpful.

  2. ChristyZhang-MSFT 26,126 Reputation points Microsoft External Staff
    2025-03-26T07:46:09.01+00:00

    Hi @Sinetemba Fumbata ,

    Welcome to our forum!

    Does this issue occur recently? If so, have you done any specific operations before that?

    Are you using Microsoft 365?

    If so, to diagnose and automatically fix common Microsoft 365 sign-in issues, run the Microsoft 365 Sign-in troubleshooter.In addition, please remove your account and re-add it to Outlook to check if there're any differences.


    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.


Your answer

Answers can be marked as Accepted Answers by the question author, which helps users to know the answer solved the author's problem.