like you are using the router for internal DNS, did you set all the services to point at caddy?

That was the answer! I had it pointed to the services, but once I set them to point at Caddy, it all worked. I cannot believe it was such a simple fix and also that I never picked up on that in all the guides/tutorials/videos I watched about this. Thank you!

I use porkbun and I do the DNS challenge. I know it succeeds because proxmox gets https perfectly fine. But none of my lxc containers get https after doing DNS challenges for them. Not sure what I am doing wrong since I clearly did it right at least once :/