Thank you very much, it really worked with some adjustment if you already have gbox installed on the tablet:
1. if you have corrupt lightroom mobile app reset it and delete it from gbox first
2.Delete gbox cache from app storage settings
3.Delete gbox entirely (you have to reload the apps in gbox already installed again later)
4.From microg.org find microg services and companion downloads and download them
5.Reload gbox after this step
6.Reload all apps in gbox including lifghtroom mobile.
This process seems to sort the problem without factory reset of the tablet as suggested by some users.