Sign-in never returns to Tented

What you see. Tented says “Waiting for your browser…” and never comes to the front.

Why. The browser that opened is not the one you are signed in with, or the hand-off did not reach Tented. After about two minutes the waiting state ends and you can try again (by design).

What to do. Click Copy sign-in link and paste it into the browser you are signed in with, or Open browser again.