Log in to your Microsoft 365 admin center and go to the following link
https://admin.microsoft.com/AdminPortal/Home#/Settings/AddIns
Select “+ Deploy Add-In”
Select 'Next'
Select 'Choose from the Store'
Search for Tribeloo and select 'Add'
Select 'Continue'
Select the desired options and click 'Deploy'
You will see a message to confirm the deployment, Click 'Next'
Message to announce the new add-in to the users, select 'Close'
Refresh the page and Tribeloo will appear in the list of Add-ins
If you have questions or difficulties with deploying the Outlook add-in,
please contact Tribeloo support via support@tribeloo.com