Outlook Add-In Deployment

https://support.office.com/en-us/article/Manage-deployment-of-Office-365-add-ins-in-the-Office-365-admin-center-737e8c86-be63-44d7-bf02-492fa7cd9c3f

https://techcommunity.microsoft.com/t5/Outlook-Blog/Centralized-Deployment-for-Outlook-add-ins-will-now-be-available/ba-p/161164