Fritz Smart Home Authentication Issue (from WAN/https)

So I am currently trying to setup the Fritz Smart Home Integration to work with my thermostates. In my old setup (everything on the LAN side of the Fritzbox) everything worked fine.

In my new home I am forced to have the Fritzbox behind another router, so Homeassistant is connecting to the WAN-Side of the Fritz Box (and forced via https and not http). I cant get it to authenticate this way.

Anyone having a tip to how to solve this?

Thanks!

Edit: I’ve dug a little deeper. If I connect via WAN, I am forced to use https. But the fritzbox doesnt have a valid SSL Cert, so the addon doesnt like that. Currently Ive found a workaround using caddy as proxy to translate https to http (weird doing it this way around) and that works, but its kind of an ugly setup.