I'm having the same issue with asking me to sign in, but signing in on the app it says incorrect credentials. It happened this morning for some reason, but worked fine for 6 months prior w/o ever asking to re-sign in. I can login successfully with the same account info on this forum, but the app won't accept the login. I wrote the login info down so I know it's correct. I requested a new password out of curiosity, but the app says that email doesn't exist? It's like the app lost my account or a connection to the account server.
I tried uninstalling the app and reinstalling but nothing changes.
Any ideas would be great.