Problem resolved itself after a full reinstall. I previously only offloaded the app, and that did not work. Perhaps my login files were corrupted? Either way I am good to play again!
iOS app not working on iPhone XR
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As for the app not working on your iPhone problem, it is either the app's error or iOS system software glitches. If it is the case of the system going wrong, you can use related iOS system repair tools such as TunesKit iOS System recovery to fix the iOS system of your iPhone. Then check to see whether the issue is resolved.
App hangs, never gets past this screen. I tried uninstalling it etc. Is the server down? What could be causing this?