I’m new to HA, last night I was trying to install themes and I noticed on the left around the bottom on the page in the configurator. It said “Brocks Apple TV” I didn’t think much of it at the time, but the next morning I couldn’t access the web interface.
I can at the moment access the PI via terminal and web based SSH, also can access the file server in finder.
At the moment using the Fing app, my Hass.io is not using its IP address from the night before instead is using my Apple TV as well as at times using all Apple TVs connected to the WiFI network.
Hmm… this looks like you have provided your apple TV a fixed IP address whilst the PI is having a dynamic IP. Have you tried to restart the PI to see if it obtains a new IP?
I´d think that this is something you need to look at in the router. Normally either fix all addresses (in a specific sub-range) or have all dynamically assigned via DHCP (and then fix some based on Mac address), but likely you´d want to have your PI on a fixed IP so you can have forwarding rules in your router.
If the Pi has the same IP as the TV and you cant access it, then turn off and unplug the TV. Reboot the PI and change its address to another one. This is called IP conflict. It means that 2 devices have the same IP and you can only access one of them (most likely the one that got the IP first). After you have changed the Pis address, you can plug your TV back.