hi @jefh
The GX50 uses L2TP/IPSec protocol for VPN. OpenVPN is not supported on the GX50.
Android 12 and newer don't support this protocol. I think Android 11 was the last version with support for L2TP/IPSec.
With Windows you'll have to edit the registry to make it work. "AssumeUDPEncapsulationContextOnSendRule" comes to my mind. I always have to look it up when adding a new vpn-client myself.
If you're still having problems, it might be best to file a support-ticket.
Cheers