tmp1 it worked for me a week ago. in secondary profile, with google store installed.
There is not much time to get the code from mail and type into app.
I had to move from ipad because it is old. I had to authorize the phone twice however. First time I got success but when i logged in N26 on PC with web browser and it said I have no devices. So i did it again, then it was ok. It looked the same as first time. Not sure what was wrong.
try deleting app data, restart and start over...