At times we have users that create channels leave the org and we end up with a rouge channel. When this happens we need to assign ownership to a new user. This blog will quickly touch on that and hopefully give some guidance on how to do so.
We will go through creating a private room then disable the creator in AD.
First we login and build a team from scratch
Once the channel has been created we add a few users to the room.
After this we disable the owner in AD
Wait for AD replication and then try to sign in as the current owner
As you can see this user is no longer valid in AD but they are still considered the owner of the channel
To fix this simply go into your Teams admin center select Teams –> Manage Teams –> select the Team you want to edit –> then select the user that will be the new owner. This should then take care of a rouge user being an owner of the channel in question.
You can disable Microsoft Teams from Task Manager and it will not start up automatically:
Press Ctrl + Shift + Esc key to open Task Manager.
Go to Startup tab.
Click on Microsoft Teams, and click on Disable.
Method 2: Change settings
You can the settings in Microsoft Teams and see if that helps:
Launch Microsoft Teams.
Click on the Profile icon on the top right corner and click on Settings.
Scroll down and clear the checkbox for Auto Start Application.
Method 3: Modifying Registry
You can delete the entry for Microsoft Teams from Registry and check:
Note: Important this section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs.