RANK X with Filter

Hi KMichael99,

Are you using SELECTEDVALUE to get the value of Position Group selected in the slicer?

And I would suggest you use a variable to capture that value before using it in RANKX measure. 

RankMeasure =
VAR __PositionGroup = SELECTEDVALUE('2023-24 Player Reference'[Position Group])
RETURN RANKX(
    FILTER(ALL('2023-24 Player Reference'),'2023-24 Player Reference'[Position Group] = __PositionGroup),
    CALCULATE(MAX('2023-24 Player Reference'[Season MV])))

Upvote and accept as a solution if it worked!