Just for the record, because MusicBee is a standard windows desktop application and not a UWP application it needs a special approval from Microsoft before the installer package can even be submitted to the store. Unfortunately as yet i havent had any response from Microsoft for over 2 weeks now and I doubt it will be ready in time for the final v3.1 release.
If anyone reading this has already been through having a desktop application submitted using the "desktop bridge" process I would be interested to hear your experience