Wireguard does not support multicast. You need to add GRE for that.
Technically, you can enable multicast on a wireguard interface, and it will send multicast traffic out on the interface just fine, but you can only send it to a single peer. This is only useful in some specific use cases, for example if you want to proxy mdns requests over a point to point wireguard link with avahi daemon with it's mdns reflector feature. Command to enable it (replace wg0 with your wireguard interface name): ip link set dev wg0 multicast on
Also, add the required multicast range/address to the allowedIPs of your peer you want to send those multicast packets to.
Wireguard does not support multicast. You need to add GRE for that.
Technically, you can enable multicast on a wireguard interface, and it will send multicast traffic out on the interface just fine, but you can only send it to a single peer. This is only useful in some specific use cases, for example if you want to proxy mdns requests over a point to point wireguard link with avahi daemon with it's mdns reflector feature.
Command to enable it (replace wg0 with your wireguard interface name):
ip link set dev wg0 multicast on
Also, add the required multicast range/address to the allowedIPs of your peer you want to send those multicast packets to.