Cannot log in to Teams any more

Question

I was invited to an external org with my personal work email (I'm a freelancer). For a while it worked ok but in the past week I can no longer sign in any more. Whenever I do try to login, it defaults to a different account and errors out. Sometimes , I can login on a web browser. I'm pulling my hair out trying to figure this out.

Correlation Id: xxxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx

Timestamp: 2025-10-23T09:08:33.000Z DPTI: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Message: Access denied for the resource. Tag: 4usqa Code: 3399614475

Answer 1

Hello design

Thank you for reaching out to Microsoft Q&A and informed us about the issue.

Based on the screenshot that you provided, I can see that you're having an issue with Teams login, please try the following steps to tackle with this issue:

1. Clear Teams cache:

• To clear Teams cache, open Run dialogue (Windows + R) and input this command:

    %appdata%\Microsoft\Tea
  

• Delete all the files and folders
• Restart Teams and login again to test

1. Reinstall Teams:

• Delete the current Teams version and download the latest version here

1. Test with incognito mode:

• If the app version still persists, please try login to Teams web version and try with Incognito/Private windows

In case the issue still persists, as the screenshot info also suggested you contact Admin for further help. Here's a reference on How to find your IT admin

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.