Aggregating Count of 1 Objects in Group-By

Hello again friends, sorry about the double post - I was having issues editing my earlier post.

$auditSample = Import-CSV .\sampleData.csv

$auditSample

Name IRNumber 
---- -------- 
Last, First1 Not Found 
Last, First2 Not Found 
Last, First3 Not Found 
Last, First4 Not Found 
Last, First5 Not Found 
Last, First6 Not Found 
Last, First7 Not Found 
Last, First8 Not Found 
Last, First9 Not Found 
Last, First10 Not Found 
Last, First01 Service Account 
Last, First02 Service Account 
Last, First03 Service Account 
Last, First04 Service Account 
Last, First05 Service Account 
Last, First06 Service Account 
Last, First07 Service Account 
Last, First08 Service Account 
Last, First09 Service Account 
Last, First10 Service Account 
Last, First 20 Local Admin Account
Last, First 21 Local Admin Account
Last, First 22 Local Admin Account
Last, First 23 Local Admin Account
Last, First 24 Local Admin Account
Last, First 25 Local Admin Account
Last, First 26 Local Admin Account
Last, First 27 Local Admin Account
Last, First 28 Local Admin Account
Admin1 Domain Admin 
Admin2 Domain Admin 
Admin3 Domain Admin 
Last, First 36 IR56242 
Last, First 43 IR56242 
Last, First 46 IR56242 
Last, First 48 IR56242 
Last, First 55 IR56242 
Dux, Frank IR56242 
Last, First 70 IR56242 
Last, First 70 IR56242 
Last, First 70 IR56242 
Last, First 70 IR56242 
Last, First 70 IR56242 
Last, First 70 IR56242 
Last, First 70 IR56242 
Last, First 70 IR56242 
Last, First 70 IR56242 
Last, First 70 IR56242 
Last, First 70 IR56242 
Last, First 70 IR56242 
Last, First 50 IR44372 
Last, First 33 IR42115 
Last, First 32 IR29068 
Last, First 32 IR29068 
Last, First 32 IR29068 
Last, First 40 IR27733 
Last, First 49 IR243582 
Last, First 37 IR243581


$auditSample | Group-Object -Property IRNumber -NoElement | Sort-Object -Property Count -Descending

Count Name                     
----- ----                     
   18 IR56242                  
   10 Not Found                
   10 Service Account          
    9 Local Admin Account      
    3 Domain Admin             
    3 IR29068                  
    1 IR44372                  
    1 IR42115                  
    1 IR27733                  
    1 IR243582                 
    1 IR243581

Trying to output:

Count Name 
----- ---- 
18 IR56242 
10 Not Found 
10 Service Account 
9 Local Admin Account 
3 Domain Admin 
3 IR29068 
5 Unique IRs