404 when trying to authenticate via iOS apps?

I am trying to get the HASS apps set up on my iPhone, and when I give it the correct URL for my HASS server, I get a 404 Not Found when it tries to go to the below authentication URL:

https://[mydomain]:[myport]/auth/authorize?response_type=code&client_id=https://home-assistant.io/iOS&redirect_uri=homeassistant://auth-callback

I am running an older HASS build (63.3) because honestly everything is working (and this WAS working) and I am afraid if I upgrade syntax will change that breaks things.

Are the current iOS apps only runnable via the paid Cloud service? I can get to it through my phone browser fine, but I’d like to use the apps.

This version is more than 2 years old. You won’t get this to work, the mobile app integration which is needed to connect the app to Home Assistant was introduced in v 0.89.

There are definitely lot of things that will be completely different and lots of things that will not work anymore and to be honest you’d be better of to start with a fresh install and move your old setup part by part to the new setup.