oh this is so funny... got my 950 yesterday, I am on O2 Germany for over 6 years, with a windows phone device for nearly 2 years (Lumia 930). I used W10m for over 3 month as a daily driver with my "old" Lumia 930, but never got VVM running... I already talked to the O2 hotline when VVM is available for WM/WP anyhow, and they told me that it is right now only available for iOS and Android...
After setup the new Lumia 950 and playing around with all the apps, I discovered THIS in the phone app:
I am pretty sure I didn't had this on my Lumia 930 (yes, same sim card).
So enabled aaaaand.... voila, have now VVM with W10m...