Display Count of Non Unique values in a column on a Card

[roygervase]

I have a table for HD Tickets one column has User and another has Ticket #.  I want to display on a card the number of users that have multiple tickets.  On the transformaiton Page the info is there for Distinct Users and for Unique. 

I could just subract and get the number.  I cannot figure out how to get the Unique number.  I want to put it in a card.  I can create a table that has the users and count of users do a filter on the visual count of Call No >1 

I want the card to show  No of users.  When there is a larger like 20+ the number of calls is not as important as the number of users which is always there question.