Microsoft Teams can be prevented from auto-starting in shared desktop environments by creating a new Group Policy object and linking it to the Users container or a Computer Container, and configuring the user Group Policy loopback processing mode to Merge.
This can also be done by creating a registry key with delete and applying it at OU level, or by enabling the setting in the application and changing the command line from system-initiated to user-initiated.
Additionally, a WMI filter can be added to a new GPO, linked to OUs and enabled to stop Teams from auto launching on machines.
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Microsoft Teams is a unified communication and collaboration platform that is now used more than ever, but it can be difficult to prevent it from auto-starting in shared desktop environments. To prevent this, users can create a new Group Policy object and link it to the Users container or a Computer Container, and configure the user Group Policy loopback processing mode to Merge. This solution has been praised by many users for its simplicity and effectiveness.
How to prevent Microsoft Teams from auto-starting using Group Policy ...
Microsoft Endpoint Manager (EPM) can be used to disable or enable the auto-start of Teams application using Group Policy. This can be done by creating a registry key with delete and applying at OU level, or by enabling the setting in the application and changing the command line from system-initiated to user-initiated. If the computer does not have Teams installed, but still the GPO applied, it will launch Teams automatically during login.
How to disable or enable auto start of Teams application using GPO
Please exit Teams app, then right click on the Start button, select the Run option and paste the following command: %userprofile%\AppData\local\ Microsoft \ Teams \Update.exe --processStart " Teams .exe" --process- start -args "--system-initiated" As result, Teams must open .…
Teams Registry Key - Microsoft Community
Is there a way to set Teams to start automatically at startup, but in the background in group policy? You can use the reg key mentioned here: https://docs.microsoft.com/en-us/deployoffice/teams-install#use-group-policy-to-prevent-microsoft-teams-from-starting-automatically-after-installation
Microsoft Teams Group Policy?