Data from a table (count and sum)

The measure in point 2 makes the sum of all the registrations for that day, but what I want is to know how many different users there are with registrations that day.

Let's explain it in another way to see if it can be understood better:
Point 3 is basically the sum of records
Point 4, of the entire month (in this example case it is January), how many days there are with at least 1 record, that is, of the 31 days that January has, how many of them there are any records.