Hello!

As far as I understand you try to use JWT tokens from Jitsi to enable authorization to allow only UNA members to create video conference (if they are logged to your UNA site). Right?

In Messenger by default, there is standard integration and it doesn't allow to use JWT tokens, because it requires to have own server for Jitsi with special settings. At present, we can perform intergradation with JWT support as modification and may be include it to default Messenger configuration in the future versions.