I tried clearing cache, and then I also started my connection over two separate times. It asks permission I'm amber, I grant it, and then it just doesn't sign. It's stuck.
Lemme also cc @brugeman
I've just tried signing in with Amber 2 times - by scanning a QR code, and by clicking "Amber", both times it completed ok after I grant the permission. Can you please try to connect to Amber with some other app, i.e. nostrudel - https://nostrudel.ninja/#/signin/nostr-connect - does it work there?