The app just loops back to the login screen. I tried reconnecting/disconnecting my account. I reset my password. I tried deleting and reinstalling the app. Strange.
My PS4 account also thinks that the Combat Knife is my favorite weapon even though I've never equipped it. Also strange.
Clicking on the Create New Account button and Link to PSN fixed everything. Cool.
Apologies for the delay in response!
I am glad to see that you were able to resolve the issue. Should you need any other assistance, please do let me know.
This is most likely a server overload error. A lot of people are logging into the app and there's probably too many people. You'll have to keep trying until the open up more space.