I've resolved this myself but just in case anyone else comes across this issue here was the problem. I had tried to open a Json file a few days ago and it had tried to open in Xcode. The file was only a few MB but Xcode could not handle it. Now every time I tried to reopen Xcode it was trying to open this file and would just hang.. not fail or given any error.. it would just hang and force quitting would show this in the stack trace. so reinstalling and removing all traces of xcode doesn't seem to stop the OS from trying to reopen this Json file when I loaded Xcode again. Shift+Option click on Xcode opens it without trying to reload previous files.. simple when you know how but really.. error handling is appalling..

This is still an issue. I am able to log into everything bar the App Store Connect. It instantly goes red and says failed to verify identity.. and i get the pop up verify thing Allow or Don't allow with a code but there is nowhere to enter the code. I was already in the app store connect about to release a new version of my app when this happened. Obviously some bug Apple side. Very frustrating.. I know I'll come back later and it will be fine but often these releases are time critical.