Comment 2 for bug 1869939

The issue might be similar to the issue reported here

https://social.msdn.microsoft.com/Forums/azure/en-US/1fef33cd-48f2-45d2-8428-28d238751621/adding-cdn-to-azure-active-directory-error?forum=azurecdn

It may be that Juju is expecting a level of access to the cluster that the credential does not allow. Maybe the level of required access by Juju can be downgraded.