Accessing Wireguard server outside of network

[fumantsu]

Hi to all,

I have the following scenario (which was working before migration to opnsense).
I have install wireguard in a Raspberry PI in my mom flat to access the network for troubleshooting (but also for VPN as it is in different country). So from my PC I have wireguard client, I was started the interface wg0 and I was able to do ssh to Raspberry PI or wherever inside the other network.

Now this scenario it is not working anymore after migration from OpenWRT to Opnsense and I'm sure that I'm missing something in the setup of Opnsense (NAT? FW? both?). Can someone give some help?
thx