Apple TV app. "Network Unavailable"

[Jason71]

I bought a Chromecast with Google TV specifically to use with Apple TV since I have no other devices that support it. That was litterally the only reason I bought it.  It worked briefly but now it constantly says "Network Unavailable" when you load the app. I am an experienced Android user I have tried the following.

Using other apps. All work fine so I conclude there is not a real network issue.

Clearing the app cache

Clearing the Data from the App

Factory resetting the chromecast.

My UK domestic broadband connections is fast stable and entirely standard. I am not even using a VPN. 
I found one other thread relating to this but the users problem disappeared by itself in a week so there was no solution given.
I did buy a new Asus router recently but I don't see how that could be related. It has been faultlessly reliable so far.
I have had the issue now for 2 months and short of trying to return the chromecast I am out of ideas

[Jeran]

Hey there,

Thank you for visiting the Chromecast Community! Since this thread hasn't had activity in a while, we're going to close it to keep content fresh. We hope you were able to get the help you need, but if you're still having issues, in this scenario I would reach out to Apple TV support, as the issue seems isolated to the Apple TV app.

If the issue persists, feel free to create a new thread, and provide as many details as possible so that others can lend a hand. Hope this helps!

Best regards,
Jeran