forgot admin user name

Have a VM, forgot username.  I can never find the username@domain string.  Where is it hiding?

I remember this being kind of hidden, like you had to go into cloud services, then list VMs, then you could see the administrator login.

But I can't find it now.  Where do I find this admin logon string?   Can't remember if it is username "admin" or "admin@machine" etc.

Thank you!