Conditional formatting in visual for multiple duplicates

Hi Anonymous ,

I created a sample pbix file(see attachment), please check whether that is what you want.

1. Create a measure as below to get the count of systems which per user logged into

Countofsystem = 
CALCULATE (
    DISTINCTCOUNT ( 'Table'[System] ),
    FILTER (
        ALLSELECTED ( 'Table' ),
        'Table'[Current User] = SELECTEDVALUE ( 'Table'[Current User] )
    )
)

2. Create a measure as below to make conditional formatting rule

Conditional formatting = IF ( [Countofsystem] >= 2, "Red" )

3. Configure conditional formatting: select the visual and click the field "Current User", Conditional formatting-->Background color

Best Regards