Nextcloud won't connect outside wifi

Good Morning All:
I have a Nextcloud server up on a Raspberry pi at my house. Runs really nice. There’s just one issue. I can’t connect to it outside my wifi network. I’m using DDNS from Dynu and the url works inside my network with the port forwarding rule on my router. The same url though doesn’t work from outside. It just sits there than times out. I don’t even get an untrusted domain page.
Is there something I didn’t set correctly on the config?

As an aside, my wireguard server works just fine using the same port forwarding rule through my router (but different port)

Thanks in advance