Apple App no longer working

My app is no longer working and I noticed Apple app is not available anymore.
How soon before this can be fixed?

OK – I just want to clarify something. I just logged into my app and it works fine. But, from what I saw in another post, the app is no longer available on the App Store, which I just verified. So if you don’t already have the app installed, you can no longer install it.

That is correct, currently the app is not available in the app store, new users will not be able to download it.

I purchased a new phone and that forced me to update the app. But because the app is no longer available, I am no longer able to use the app.

This also happened with a couple games I had on my phone.

But I’m paying for troop track, not the games.