Can't find the Decisions add-in when browsing for apps in Teams

The most likely reason why the Decisions add-in is not showing up, is that there are policies blocking the app from showing up in the app gallery in Teams. To fix this check the following.
    1. Go to: https://admin.teams.microsoft.com/
    2. Teams apps > Permission policies
    3. Make sure 3rd party apps are allowed
    4. For each policy, review 3rd party apps and make sure Decisions is not listed as blocked
    5. For more information see the Microsoft documentation: https://docs.microsoft.com/en-us/microsoftteams/teams-app-permission-policies#edit-an-app-permission-policy