I hadn’t used ARC all day and your post reminded me to launch it. Location: Germany
This is all I saw after starting it 
, on Android 12:
Then I quit the app and started it again, now there is the expected login screen:
After clicking Login I got the expected web login page. After entering my credentials, it showed this without apparent progress (the ARC app in the meantime showing the red “something has gone wrong” message):
So after a minute or so I clicked, but this only got me back to here:
I clicked Login again and another Web login page came up, asking me to choose the account:
I selected my account and then the ARC login seems to have worked. Note that I am not home, so I can’t re-login Roon at home yet:
