sshd_config + AllowGroups + AD group

I am doing some tests with the AllowGroups settings in sshd_config.

We have a security group which contain all our administrative accounts that should have access to the vMA. I only want to allow this group.

I now have done some tests with the following settings:

AllowGroups example\vma_admins

and

AllowGroups example
vma_admins

This does not work as expected, after setting this settings i can't login.

Is this a shortcoming of likewise open?