How can I tell if a customer has created their Service Desk account?

Question

I sent out invitation emails to customers a while ago and heard from some of them that they never received an email.  I had them check their spam/junk, but they claim they never went through.  I deleted these specific users and then recreated them so I could re-send the invites (having a way to resend the invite to created customers would have been nice).

So now I worry that other customers may not have received their invitation to Service Desk.  Is there a way I can tell as an admin whether or not a customer has created an account?  They already all appear in the Customer list as soon as I generate the invitation, so I can't rely on that.

Jobin Kuruvilla [Adaptavist] · Accepted Answer

Maybe check the last login time of the customer? If it is blank, they never logged into the instance yet.