Issue/Question
- Why is Microsoft Teams not letting me log in?
- Why is Teams giving an error of the Trusted Platform Module has malfunctioned when trying to sign in to Teams?
- Why is Teams giving me an error code 80090030?
Environment
- Oregon State University
- Microsoft Office
- Microsoft Teams
Cause/Explanation
If you are seeing this error, you may need to disable something called "modern authentication".
Resolution
Method 1 - Disable Modern Authentication
- Close all Microsoft Applications via Task Manager.
- Back up all your important documents and files.
- Open Regedit.msc.
- Click on File and export your current registry keys as a backup.
- Go to HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity
- Once you are in the Identity folder, on the right side, click Edit and New->DWORD(32)
- Name it EnableADAL and give it a value of 0
- Restart the system and try opening Microsoft Teams again.
See also: https://answers.microsoft.com/en-us/msoffice/forum/all/error-80090030/f5fb6ef7-3973-4204-8b06-3a74bea066c9
For assistance, contact the Service Desk.