Removing and Office 365 Tenant

In my Azure Portal, I followed the following instructions and added my Office 365 account.

https://msdn.microsoft.com/office/office365/HowTo/setup-development-environment#bk_CreateAzureSubscription

under

"Associate your Office 365 account with Azure AD to create and manage apps"

Now I need to remove this association and when I try to do that I get an error saying there are applications associated with this tenant.  When I go into the applications the delete option is not there, how do I remove this?