Distinct count + Display the right class

Hi, Anonymous 

Based on your description, I created data to reproduce your scenario. The pbix file is attached in the end.

Table:

You may create a measure as below.

Re = 
var tab = 
SUMMARIZE(
    'Table',
    'Table'[Test],
    "Result",
    IF(
        [Test]=1,
        CALCULATE(
            DISTINCTCOUNT('Table'[ID]),
            FILTER(
                ALLEXCEPT('Table','Table'[Test]),
                NOT([ID] in 
                CALCULATETABLE(
                    DISTINCT('Table'[ID]),
                    FILTER(
                        ALL('Table'),
                        [Test]=2
                    )
                )
                )
            )
        ),
        DISTINCTCOUNT('Table'[ID])
    )
)
return
SUMX(
    tab,
    [Result]
)

Result:

Best Regards

Allan

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.