SSB side available
You have an SSB feed
Your client proves the feed is yours by signing a challenge from the room. Nothing is typed here and no password exists to steal.
Needs a client that supports SSB HTTP Auth and an open connection to this room. If the room cannot reach your client the sign-in fails rather than hangs.
ATProto side available
You have an ATProto account
Sign in with your handle to see what this bridge has mirrored from your account, and what failed on the way.