Bought two. Short circuit in a plug for one of the cables. Since they were new, I misinterpreted the issue an returned the connected device instead of the cable! This is clearly my mistake but it is nevertheless true that one of the cables was not functional.
Ich muss euch ein Kränzchen winden: Ich bin immer wieder überrascht & beeindruckt von eurem Service & eurer Effizienz.