I started ARC for the first time after the last EA update and getting the Unauthorized banner and connection status, plus „Something went wrong“ toast.
I didn’t switch Roon Server nor did I restore a backup. The only thing I did was clean up some old sessions on account.roon.app a few days ago. Don’t know if this is related to B408, so posting here in EA.
Same on cell network and home wifi.
I suppose this will end up with me having to uninstall/reinstall ARC yet again 
but I will hold off because I want to give Roon Labs a chance to investigate this. This doesn’t look like normal behavior.
Forget it, I’m reinstalling . I searched the forum a bit and concluded that I probably inadvertently deleted the ARC session on the accounts page when I cleaned out a lot of old stale sessions, and I suppose that’s terminal. You already know how bad the design is, considering that I’m logged in again with the very same credentials, but whatever. I hope you figure out some time how to do this correctly.