I had the same problem. Amber got the auth request and signed but flotilla hangs after that.
nostr:nevent1qqs2rlyp2gkhtszgh50nprtz4vmslllmw8y6mywr69p6sghsyl077dgpz9mhxw309a6k6cnjv4kr5dpcxsuz7q3qq67f4d7qdja237us384ryeekxsz88lz5kaawrcynwe4hqsnufr6sxpqqqqqqz76cxy3