App can't connect on mobile network

Hi guys,

Yesterday I successfully setup my mattermost instance. The issue I have is connecting to my server with the app on a mobile connection.

When I’m on my home wifi or use a VPN connected to my home network when on the go, the app works. When I try to access the instances via web browser it works on a mobile connection and without a VPN.

I use a reverse proxy (traefik) to connect to the instance.

Can anyone help me to troubleshoot this?