This appears to be some unusual problem with google authentication, on the app + device browser side of things, but I'm unable to reproduce the problem here, so it may take a while to find out what's going on.
If you have this problem, and can log in via web browser on desktop, I recommend converting your account be be email based instead of google (Nexus -> My Account -> Modify Account).
If you can't use the browser version and want your account converted, pm me your google account's email address and one of your character names and I'll convert it for you.
Bookmarks