Your configuration is sound. The port forwarding on AirVPN, though, does not support IPv6 yet (it's rather port sharing with v6, but anyway… you know what I mean).
Hello! Update: AirVPN Suite 1.2.0 Release Candidate 1 is now available. Original message download links and changelog have been updated accordingly. RC 1 is linked against the new OpenVPN3-AirVPN library and fixes all the glitches you have found so far in beta 1. Thank you for your tests!
Kind regards
Preferences > UI > unset Exit confirmation prompt.
Engage NetLock and connect, then in Logs tab click the lifebelt icon and paste/upload the output. The community can help you better with such technicalities.