Custom DNS blocked on iOS

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I've gone through and setup, to the best of my ability, blocky on docker. At the moment everything is working correctly on my desktop (Fedora 43 and Windows 11 using Firefox in both cases), however, any of my custom dns entries for my domain fail on my iOS devices.

For reference, the way I'm using my domain is as follows:
service.mydomain.com

I'm using Traefik as my reverse proxy and as mentioned above, this is working exactly as expected on everything except for iOS devices. The relevant custom dns configuration in my config file is:

mapping:
mydomain.com: 192.168.0.11

Where 192.168.0.11 is the docker host for my Traefik instance.

I'm sure that it's a schoolboy error somewhere in there but would appreciate any help. Happy to provide further details if that would be useful.

Many thanks!