Can't Connect to WireGuard server on GL-AXT1800

I’m trying to setup a VPN server at home. I have two GL-AXT1800 routers. I setup up the one that will be the server and am testing the connection on my phone first, before I setup the client router, but I can’t connect to the server. I turned on DDNS on the server router and I have a public IP. I set port forwarding on my main router too. Maybe I did that wrong, I don’t know what else the problem could be. Is there something I’m missing?

Can you access the router’s web pages via DDNS if you enable remote access for DDNS and forward port 443/80 of the AX1800 on the main router? Please test without VPN.