dynamic conditional formatting with virtual table and switch

Hi, im having an issue building dynamic conditional formatting on my visual (color columns)

The reason why i need to build that are all spaces in between columns in a chart, if more trafo numbers are selected than the spaces gets bigger

To do that i added a table with ColorID and HEX rgb.

I want to build virtual table with all selected Serial Numbers from slicer, adding HEX rgb by matchin the ID from virtual table and colorID 

and then with switch return HEX rgb. The problem i have is that it always return same hex rgb with index nr 1 

IndexColorTrafo =

var CurrentSelection=MAX(MeasurementsByFrequency[Serial Number])

VAR SelectedTrafoIDs = VALUES(MeasurementsByFrequency[Serial Number])

VAR NumSelectedTrafoIDs = COUNTROWS(SelectedTrafoIDs)

VAR VirtualTable =

    ADDCOLUMNS(

        GENERATESERIES(1, NumSelectedTrafoIDs),

        "TrafoID", SELECTEDVALUE(MeasurementsByFrequency[Serial Number]),

        "ColorID", LOOKUPVALUE(TblCSSColor[Hex rgb],TblCSSColor[ColorID],[Value])

    )

RETURN

 VAR Output= MAXX(

        VirtualTable,

        //VAR CurrentTrafoID = [TrafoID]

        //RETURN

            IF(

                NumSelectedTrafoIDs = 0,

                BLANK(),

                SWITCH(

                    TRUE(),

                    //[TrafoID]=CurrentSelection,

                    CONTAINSSTRING(SelectedTrafoIDs, CurrentSelection),

                    [ColorID],

                    BLANK()

                )

            )

    )

Return

Output

anyone can help?