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Excel 2016 – How to count UNIQUE rows that are “assigned” to someone?

I am building a chart that contains the total amount of rows and accounts assigned to a user in Excel 2016. The first issue is easy and I resolved it with a COUNTIF function, however the second part I’m not certain of the best way to do it…

I wish to be able to count the number of unique rows based on two values (I think that’s the right way to word this scenario)…

For example, take the following data:

   A                  B
   Account Number     Assigned User
01  12356             Anthony
02  12356             Anthony
03  12356             Anthony
04  48151             Anthony
05  48151             Anthony
06  20235             Barbara
07  12345             Barbara
08  88514             Anthony
09  89752             Daniel
10  89752             Daniel
11  89752             Daniel

I’ve been able to count how many unique entries under a column (so 3 total Assigned Users, 6 total Account Numbers), however in this example, I want to calculate how many unique Account Numbers per user.

The expected output I’d want is something like this:

   A                B                 C
1  Assigned User    Total Accounts    Total Rows
2  Anthony          3                 6
3  Barbara          2                 2
4  Daniel           1                 3

Where the “Total Accounts” column would contain the total count of UNIQUE account numbers.
For “Total Rows”, I’m using the following function: =COUNTIF('Master List'!B:B, A#) (replace A# with A2, A3, A4, etc. for each user name), however how would I structure a function/formula to get the values for Column B, “Total Accounts”?