Issue: Applications Not Appearing as Available for End Users

Further to my previous post, we also tried an InPrivate window, and the Apps page worked fine.  As such, we had users clear the cache in Edge, specifically the following;

Cookiees and other site data

Cached images and files

...and its working fine now.

However something in the service has clearly changed, something Edge specific, that means the currently cached files/cookies/etc aren't compatible with the change, and must be cleared, and downloaded again.