Installed Vr Matkalla app to my new daily driver Jolla C2 and noticed that the seat cannot be selected with this either. Jolla C2, Tampella 5.0.0.55, microG 0.3.6.244735.
Earlier I had reported that it works without microG so could that be a microG related problem?
Have you tried with an earlier version?
I do not have a full log of versions
Does not work
Jolla C2, Tampella 5.0.0.55, microG 0.3.6.244735, App version 1.52.8
Xperia 10 II, Sauna 4.6.0.13, microG version ?, App version 1.48.8
Works
Jolla C2, Tampella 5.0.0.43?, no microG, App version 1.51.17
The app works
Xperia 10 II, Tampella 5.0.0.67, no microG, App version 1.55.6
when installing MicroG after granting permissions the permission “Play Store (Phonesky) has correct signature” breaks the app.
Seat selection isn’t visible for me on Jolla Phone 2026 with VR Matkalla version 1.66.6. Everything else I have tested in the app works fine. I am running microG Services version 0.3.15.250932. SFOS version is 5.2.0.16 (Finlayson).
Same here. So I replaced the Android app wit a browser shortcut and seat selection works. Have to check how convenient it is to buy and show the ticket, but at least in the history (previous trips) I could see the qr-code ticket. So, might stick to the web version. One Android app less is always good. 
It is good to report this issue to VR too so they know that there is more to this world than AnroidIos:)
My report was something like "can’t select seat. Device : Jolla Phone 2026. Fix it„
Examined the logs while trying to select a seat:
WagonMapScreen loads, but fetching the map data requires a Firebase App Check token, which relies on Play Integrity attestation. On this device Integrity returns error -100 (INTERNAL_ERROR), so App Check falls back to a placeholder token and the network request goes out unauthorized (“no auth token for request”).