Outlook addin not working in Outlook for Android

[ZeeCapp]

This is a follow-up to a question that was partially answered in issue #5278

I have been informed that apps using unified manifest cannot be sideloaded into mobile Outlook and they need to be installed through AppSource or MS 365 Admin in order to work on mobile.

We have tried this approach and this doesn't seem to work. We have published a testing app to our organisation (same manifest as in the issue mentioned above) and the app doesn't show up in the mobile app. Is the manifest itself wrong are are we not understanding the process correctly?

Thanks for any help!