Can't access some services behind reverse proxy

[samuraiapocalypse@lemmy.zip]

Hello! I have 2 services that are only being accessed locally but require HTTPS so I am using Caddy & DuckDNS w/ DNS-01 to reverse proxy them. In DuckDNS, both subdomains are pointing at the local IP address of Caddy, and my Caddyfile has:

service1.duckdns.org:443 {
        tls {
                dns duckdns {
                        api_token API-TOKEN
                }
        }
        reverse_proxy 192.168.0.51:8080
	}

service2.duckdns.org:443 {
        tls {
                dns duckdns {
                        api_token API-TOKEN
                }
        }
        reverse_proxy 192.168.0.20:8080
	}

The issue is that I can access https://service1.duckdns.org/ (within my home network), but I can't access https://service2.duckdns.org/ (502 Bad Gateway). Caddy is running in a LXC in Proxmox, and Service1 is on a different VM on the same Proxmox machine, while Service2 is on a different machine on my network. I don't see any entries in my router's firewall logs or PiHole that indicates something is blocking it. I enabled logging in Caddy for both services and I am only able to see activity for Service1, so I guess that means something is blocking Service2 from reaching Caddy entirely?

I'm able to access service2 directly from the IP address but I'm a novice in networking so I'm trying to understand and learn what could be causing this. Any help would be appreciated!