“A server with the specified hostname could not be found.”

I just downloaded and subscribed the app ‘ACR Automatic Call Recorder’.

However, when I enter my number in the app, it continuously keeps popping up this message, “A server with the specified hostname could not be found.”

Hence, I cannot use it, and the AppStore does not even allow me to inform the developers of this issue.

This is really irritating and wasting my time, and most importantly occurring even after I have subscribed by paying for it.

Someone, kindly help me out by providing a suitable solution.

These are what I tried prior to this request, Restarting the device, uninstalling and reinstalling the app, removing sim and reinserting it, resetting network settings, changing WIFI connections and few more.

I use an iPhone SE with the latest update, and I live in Sri Lanka.

Thank You!