I've been trying to get Pokemon Go 0.39.0/1 to work on Jolla C, and the game does launch up to login screen, but then I always get "Unable to authenticate". Anyone else had this same issue and how to resolve?

I've checked that the account works on another phone. Tried both trainer account and google account based authentication, same error on both. Did also the "su" renaming, no help. Google services are installed with the TJC Jolla C instructions (did try redoing that few times as well).