A Powerapp I made for one of my customers has stopped working on all the machines in his office. Yet it works on my computer and works on his if he uses Chrome. He gets to the powerapp using the Dynamics 365 link in the App Launcher and it shows the attache. None of the permissions have changed and nothing has been done to change the app. The problem started on Thursday last week 27th July.
When I investigated I saw all sorts of different errors including Auth error and 'That link didn't work, please try again'.
I've tried deleting the cache on IE.
We are all using IE11, he uses Windows 7 and I use Windows 10. All use Office 365. The app was created using the installed client of PowerApps. The app has a data connection to SharePoint list in the SharePoint group. All the permissions remain the same.
Any ideas?