Sorry, i thought i was clear.

I used the proxmox ve helper script from here: https://tteck.github.io/Proxmox/ to install ha os.

The local domain does not get resolved how it should, i hoped someone here might have hosted ha in proxmox themselves or ran into a similar problem, or could give me a hint what to check

Thanks for the advice, i was thinking about it anyways :) i used the proxmox ve helper scripts: https://tteck.github.io/Proxmox/ to install it