SSH over softether VPN coection

I configured my Raspberry Pi as a softether VPN server (according https://jlnostr.de/blog/raspberry-pi-sstp-vpn-server-installieren/). I can now create a VPN coection from my Windows machine to the Raspberry. The Windows machine gets the VPN-IP 192.168.30.10 and the Raspberry has the VPN-IP 192.168.30.1. Pinging the Raspberry (ping 192.168.30.1) works, but I can not establish a SSH coection to the Raspberry over this VPN network.

How can I configure softether to forward/accept SSH traffic on port 22?