Selectedvalue - conditional formatting - slicer value

Hi Experts,

I hope this is the right place to get some help for my issue:

I would like to do something like this: 
DAX Fridays! #212: VALUES vs SELECTEDVALUE to conditional format a line chart - YouTube


And for a Test I did it how it was explained and it works:

Test4 = 

var selectvalue = VALUEs(Abfrage1[id])

return
If(selectedvalue(Tabelle[ID]) in selectvalue, "y" , "n")

but for the real data with the same code:

Test4 = 

var selectvalue = VALUEs(Abfrage1[Index.1])

return
If(SELECTEDVALUE(Member[Index.1]) in selectvalue, "y" , "n")

I get only "y" as the results...

Does someone has a tip for me😢?