I've never done shops with them, but I remember it would always remember my login info when accessing. I got the same errors as everyone else, but clearing cookies for the specific site resolved it for me.
@nolimitem @Rho* If you use Chrome, follow the steps below to see if this resolves it for you.
In Chrome, click on the ellipses at top right next to your avatar
Settings
Privacy and security
Site settings
View permissions and data stored across sites
Search or go to Amusement Advantage
Delete site data and permissions
After, re-access website and reenter login info