Multi-User Collaboration - LAN only? VPN possible?

Hello there

We’re trying to join each other with a friend on the method suggested using softether vpn. I managed as a client to connect to my friend hosting the vpn, but I don’t find his server in the multi user browser. We used the tricks in the “advanced networking” chapter (https://docs.unrealengine.com/en-us/Editor/MultiUser/MultiUserReference#advancednetworking) and all, without success.

So to clear this out did you managed to join online with this method ? If so I must have missed something here