Are you able to install the Outlook Add-In from the MS Admin Center integrated apps? If so, what is the app called to search or the location of the manifest file to add. If not, what are the methods to install the add-In.

Are you able to install the Outlook Add-In from the MS Admin Center integrated apps? If so, what is the app called to search or the location of the manifest file to add. If not, what are the methods to install the add-In.
Hi deputy382,
I'm not sure that it is your need or not. However, please check this: