can't reach my server from outside

franzi

Hello, i have a linux server running, with some containers, in my home connected with Ethernet. I have a Zyxel router with port 80 opened and a personal domain with duckdns. Inside my network I can reach my server with internal IP but with my domain i reach my router page. Instead from outside my network is unreachable. Someone can help me? I am not network expert.