Same problem for me. App doesn't login. Galaxy S20.
I am having this problem too, on two of my devices, and different versions of the android app (one has old version, the other one is latest). "Sign in" dialog hangs for a long time, issuing challenges does not work, etc. Seems like something changed on the server that only impacted the mobile app.
The problem might be captured by this ticket: github.com/veloce/lichobile/issues/1708
and the workaround (pressing on "study") does seem to be helping in my case.
Same issue for me on my Android app. My profile does not load or the loading process is really slow. I can't see my friends online, I can't see my correspondence games on progress... It happens regularly since 5-6 days.
I think the problem's been fixed via some server update. I've been able to seek and play games for the last few days (with the same version of the app that exhibited the problem).
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