Invited but not Enrolled - Report

We're currently in the phase where we're trying to roll out our ADSS+ to a live test group, to shake out any issues we have with the reception and function. However, our users in this group are not in an OU, but in a pair of Distribution Groups. As a result, when trying to invite them, we're first getting an error that there are no users listed in the policy, but clearly in the Active Directory, there are users setup in these groups.

However, if this proves successful, then we'll move to groups in OU's. In the meantime, I've simply gathered up the end users in a CSV file and cut-and-paste them in to send out an invite. Which brings me to the question: Is there a way to report on those who have been invited, but whom have not yet enrolled? (Or, should this be a feature request?)

--Michael Hackett