Please make sure that only the owner of the team is adding the bot, if you are a member it will not work.
Download bot manifest .zip package from here:
To upload the .zip manifest package into your Microsoft Teams app click on upload a custom app and select the zip file you have downloaded in previous step.
Add Looop bot into team or multiple teams which users should be able to receive notifications from Looop bot via campaigns.
In Apps click on build for… and select a team or multiple teams you want the bot be added into:
Before being able to receive the notifications, please make sure that the Microsoft Teams integration is enabled in your Looop app's account settings.