I asked this on the OB6 thread but haven't gotten an answer. It occurs to me that it's possible that maybe it's specific to the P6 module. MPE for Y/Z is working for me, but pitchbend is mono. The setup I have is:
Sensel Morph (USB) -> iMac -> Bitwig -> iConnectMidi4+/MOTU Ultralight (I tried both) -> midi to p6. installed OS, reset globals, and set midi channel to MPE.
Did I miss a step?