Need help creating a measure

My apologies but I'm trying to calculate it by month.  Example below.

I should see 2 employees for January and 1 for February for a total of 3 as highlighted in red above.

Here is the result from your measure:

Hi buttercream here ISINSCOPE handles the total row correctly by summing the monthly values instead of recalculating across all months. Sharing the PBIX file for reference.

buttercream 

Assuming you have a period column the following DAX expression should give you what you're looking for:

Finance Emp 3+ Leaves = 

VAR _Group = "FINANCE"

VAR _Base = 
SUMMARIZE( 
        CALCULATETABLE(
            'Table',
             'Table'[Group] = _Group
        ),
    [Employee], [Period]
)

VAR _CheckLeave =
FILTER(
    ADDCOLUMNS(
        _Base,
        "Leave", 
        VAR _Emp = [Employee]
        VAR _Period = [Period]
        RETURN
        CALCULATE(SUM('Table'[Leave]), 'Table'[Employee] = _Emp, 'Table'[Period] = _Period)
    ), 
    [Leave] > 3
)

RETURN

COUNTROWS(_CheckLeave)

I've attached a sample pbix for you.