I had the issues from the beginning, stuck in "pending" first, after the update a short flash "pending", but without response from Simbrief.
Interestingly FlyByWire's A320 works fine, so I did some debugging with Wireshark (network monitor).
I detected that FBW uses TLS 1.2 whereas the Inibuilds A310 uses TLS 1.3 and the handshake is stopped with "expired certificate".
I am on Windows 11.
Does anybody know how to disable TLS 1.3 for A310 or "Microsoft Flight Simulator 2020" or for the whole browser (edge) or computer?
Holger