Can't get rid of Green Screen after it was setup initially

I have the same issue with macOS Tahoe 26.3 and couldn't find any way to fix it. Any other suggestions?

Dear @Alan Chai,
Thank you for posting your question in the Microsoft Q&A forum. I understand that you enabled the green screen feature in Microsoft Teams on your Mac, and now the camera remains locked with that effect, even after toggling it off. Clearing cache, reinstalling Teams, and deleting folders didn’t resolve the issue. The camera works fine in other apps and Teams Web, so the problem is specific to the desktop client.

This issue is likely due to local configuration files or preferences that remain even after uninstalling Teams. These files store green screen settings and can cause the feature to stay active.

To better assistance, could you please confirm following information:

1. Do you have any custom backgrounds imported?
2. Are you signed into multiple Teams accounts on the desktop app?
3. Which Teams version you are currently using?
4. Is this happening in all meetings or only specific ones?

Then I would like to confirm that you have tried steps to fully reset Teams’ video settings as detail below:
1/ Before starting: Quit Teams completely (Cmd + Q) and ensure no Teams processes are running in Activity Monitor.

2/ Remove stuck settings and caches

• In the Finder, open the /Applications/Utilities folder, and then double-click Terminal.
• Enter the following commands, and press Return after each command:

rm -rf ~/Library/Group Containers/UBF8T346G9.com.microsoft.teams 
rm -rf ~/Library/Containers/com.microsoft.teams2

• Restart Teams.

3/ Clear Teams credentials in Keychain

• Open Keychain Access > search for Microsoft Teams, Microsoft 365, adal, MSAL
• Delete entries related to Teams
• Restart your Mac

4/ Reset video effects

• In Teams navigate to Settings > Devices > Camera, ensure Green Screen is OFF
• Click Reset background effects
• Remove any custom backgrounds
• Run a Test call to confirm normal camera view

If the issue persists, update to the latest Teams and macOS, or test on a fresh macOS user account. If it works there, the original profile was the cause.

Please understand that our initial response does not always resolve the issue immediately. However, with your help and more detailed information, we can work together to find a solution.

I truly appreciate your patience and understanding. If you have any further questions or need further clarification, please feel free to reach out. I'm looking forward to hearing from you. 

Thank you for your cooperation.

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