Can you show the diff with your previous WG config?
Is 10.11.12.0/24 also on enp3s0?
I am able to connect and can ping 10.11.12.77, the IP address of the server, but nothing else
Including the wider internet, if you set your phone’s AllowedIPs to 0.0.0.0/0? This makes me think it’s a problem with the NAT, not so much wireguard. Also make sure ipv4 forwarding is enabled:
Reading this article might help! I know this is not what you asked, but otherwise, my approach to accessing devices on my LAN is to also include them in the WG VPN - so that they all have an IP address on the VPN subnet (in your case 10.11.13.0/24). Bonus points for excluding your LAN guests from your selfhosted subnet.