Hi John, bit of a guess here…
I think it’s due to the differences between Office 365 versions.
At last count there was Office 365 Home, Office 365 Personal, Office 365 Student, Office 365 Business and Office 365 Professional. Hmmm, might have missed one!!!
Anyhoo, I’ve discovered in the past the these versions do not share identical access priveleges to Microsoft’s cloud services – this took me ages to work out!! Some of them get no access and some of them get read only access. Unbelievable but true!
E.g. I’ve got a Office 365 Home license covering all my stuff at home but when I add my Glow account to some apps I get problems. I’ve also discovered that the Mac OS version of OneDrive (via the Mac App Store) doesn’t work for Glow but that the top-secret OneDrive for Business app does, yet this version is currently only available from the Microsoft web site. Furthermore, some versions can get limited access using the ‘Microsoft Document Connection’ app.
In light of my experience I decided not to bother with the iOS version so you’re braver than I am!!
Not sure if that helped at all – or if it was even correct!!!
Let me know if you make any breakthroughs!!
Cheers
Chris