https://docs.opnsense.org/manual/how-tos/wireguard-selective-routing.html#step-6-create-a-gateway (https://docs.opnsense.org/manual/how-tos/wireguard-selective-routing.html#step-6-create-a-gateway)
Connecting OPNsense to a VPN endpoint appears to have quit working in for me on 23.7.6.
When creating the interface I am no longer allowed to assign a static IP. I get the error "Cannot assign an IP configuration type to a tunnel interface"' Wireguard appears to be running but the gateway is down. This configuration worked up until this version and no other configuration changes were made.
I have the same problem. Did you manage to solve it?
Please read:
https://forum.opnsense.org/index.php?topic=36403.0
Check https://homenetworkguy.com/how-to/configure-wireguard-opnsense/ for a (working) way to set this up without interface IP addresses. (The IP address is taken directly from the wireguard portion of the setup)
If going from the os-wireguard-go to the os-wireguard plugin (like me), the config of the first is still there after uninstalling the first and installer the latter.