Same noise (from #18) here in Munich on cold mornings. I can definitely say that it is not coming from the (all) control arms, the strut bearings, or the output shafts, as all this parts were already exchanged in the last years due to other problems.
Actually I suspect the dynamic dampers due to the cold oil inside. It is more or less a comfort problem or "Serienstand" (--> current model version) would BMW say here
