I created an app that about 40 staff access. For most, it works fine, but I have 3 people so far that it doesn't work for. The issue is something to do with permissions on the connection to SharePoint lists. To troubleshoot, I connected to the machine, made the person owner of the app and then tried to edit the app - below is the issue - it says she does not have permissions to the SharePoint list called PAR user Permissions, but she does. I am able to access that list directly in SP as her. I checked the other SP list connections and it actually says this for all of them. Again, permissions are correct in SP for all lists.

Is there way to reset the connection? or something to fix?
Things I have tried:
- remove person and re add to the app
- elevate their rights in SharePoint
- make them owner of the app
- clear all browser history
- incognito window
- multiple browsers
I am at a loss - please help Microsoft world!😊
Thanks
Ian Hudson