Hi, @Aang.
Welcome aboard to the Roku Community!
We see you are having a hard time signing in to your Roku Mobile App. We are glad to offer assistance.
Have you tried uninstalling your Roku app and then installing it again? If not, we highly recommend doing so to see if it makes a difference.
Also, try restarting your phone to reboot its system.
In addition, make sure that you downloaded our Roku Mobile App | Official.
Let us know if this resolves your current login issue. If the issue persists, please keep us posted so we can take a closer look at the situation.
Sincerely,
Emman
Emmanuel-D.
Roku Community Moderator