Cannot delete directory due to Office 365 Management APIs

Hello,

I was having a play and created a Directory. I am trying to delete it, but it says it cannot be deleted because "Directory contains one or more applications that were added by a user or administrator.

The directory hasn't been used, and I'm the only one to have logged in.

In my Applications list I have "Office 365 Management APIs", I do not have an Office365 account. I tried using the MSOnline cmdlets but of course cannot connect without an account.

I only have free Azure with my MSDN account and so cannot raise a technical support ticket.

Any ideas please?

Thank you 

Russ