Download manifesto
Firstly, you need to download the latest manifest for the anny Teams app. You can find the ZIP file at the following link https://anny.eu/teams-app/anny-teams-app-eu-plus-latest.zip
Upload manifest
To add the anny Teams app, you need to upload the manifest. To do this, go to Teams under Apps > Manage apps > Upload app
You should have administrator rights to be able to distribute the anny Teams app to your entire team.
You can find more information in the Microsoft documentation on this process: Upload your custom app - Teams | Microsoft Learn