Private app shared with partner organization cannot be onboarded in their UEM solution.
I have added a private app to our managed play store (MS Intune) and followed the steps documented in Distribute private apps to make this available to a partner organization but unfortunately when they attempt to add the app to their UEM solution (Omnissa Workspace ONE) by play store URL they receive a http 404 response and cannot proceed.
We have shared an app with them previously (same app, different productFlavor with app id suffix) and that worked seamlessly so we are bit stumped.
Reaching out to our respective vendors has not been fruitful so it's not entirely clear what to do next, would appreciate any advice you have!