Had pretty much ALL the problems mentioned in any thread here for days. After updating the app to V0.5.7 today, everything worked like a charm. Used ID number from the paper with phone number to create account (via mobile data NOT WiFi).
I actually managed to get in after trying the 30ish email-address (using maildrop.cc) and encountered the exact same problem. It did work though after downsizing the attached pictures to a more reasonable size.