Cannot Find Virtual Attribute

I've created a virtual attribute and associated it with the Group class.  Then customized the group properties form and tried to add that virtual attribute to the form but when I bring up the attributes, select show all possible attributes, the virtual attribute does not appear.  I've gone through these exact steps with a user class virtual attribute on a user properties form and no issue at all finding and adding it but for some reason I cannot find this group class virtual attribute when trying to add it to a group form.  Also cannot find it if trying to create a menu command to "Set Attribute Task", when I go to pick the attribute the virtual attribute does not appear.  I've tried multiple times, restarted admin service etc but to no avail.  What am I doing wrong here?