Remote Access to Octopi

I have setup my raspberry pi with Octopi and another raspberry pi with Pivpn so I can remotely access Octopi remotely when I am away from home.
I followed the instruction fp, youtuber "crosstalk" When establishing the VPN from my iphone using wireguard. I am able access my home network and also ping and access some of the devices on my home network but I canot get the the browser to work with octopi.
I also have octopod installed on my iphone which works great when connected to my home wifi network. This also does not work

What did you already try to solve it?
I am not sure what else to try

Logs (syslog, dmesg, ... no logs, no support)