Trying to Calculate How Many Employees Worked on Multiple Customers in Given Time Period

Thank you for the quick response Greg_Deckler!

This is giving me 98% across the board for every week (which I would expect to see around 30%). Something I accidentally omitted in my example data was that customer numbers will often repeat, and I can only count each unique customer once, sorry for the confusion!

Spudder112 Well that certainly makes a difference but should be an easy fix. PBIX is attached with ammended data to demonstrate a duplicate.

Employees Working More Than 1 Customer Measure = 
    VAR __NumEmployees = COUNTROWS(DISTINCT('Table'[Employee ID]))
    VAR __Table = SUMMARIZE('Table',[Date],[Employee ID],"__Count",COUNTROWS(DISTINCT(SELECTCOLUMNS('Table',"__Customer",[Customer]))))
    VAR __Result = DIVIDE( COUNTROWS(FILTER(__Table, [__Count] > 1)), __NumEmployees) + 0
RETURN
    __Result