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I have tested on my side, this formula works well
could you please share your sample pbix file for us have a test, there should be something wrong in other.
Regards,
Lin
@PowerBITesting , this should have given you
CALCULATE(DATEDIFF(Min(activitypointers[createdon]),MAX(activitypointers[createdon]),DAY))
Check the datatype too
Can you share sample data and sample output in table format?
@PowerBITesting - That's very odd, can you share the PBIX?