This is a great thead!!
I've added 6NS to the FA & VO coded into HU-NBT2 in my 2018 F87 M2 (I think 6NS only effects the HU module, is that correct?)
I've now got 2nd phone option and the car requests access to my phone messages too. I've checked "office" in bluetooth settings, but still no "office" or "messages" menus in Idrive...
Any help or ideas guys?