If you want to set up app permission policies in Teams, you must be an administrator in your organization (global administrator or Teams administrator).
To create an app permission policy, follow these steps:
1. Sign in to the Teams admin center and go to Teams apps > Permission policies.
2. Select Add.
3. Provide a name and description for the policy.
4. Under Microsoft apps, Third-party apps, and Custom apps, select one of the following options:
o Allow all apps
o Allow specific apps and block all others
o Block specific apps and allow all others
o Block all apps
For more details about setting app permission policies, you can refer to this document
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.