there is no setting to enable.
do you have your key fob on you?
did you option the tow hitch? If so, hands-free kick-to-open feature is removed.
also, you inquired on this issue with another thread last month. why the new, separate thread?
Hands-free Trunk open/close
https://g05.bimmerpost.com/forums/sh....php?t=1860710