Given that there have been changes from 2.7, I ask you what changes have been with respect to the previous procedure:
Once a target is locked.
1. TDC Fwd (IRMV) is pressed
2. Press cage / uncage
3. Press TDC Down (repeatedly, until you lock)
It currently did the above, but failed to get the Mav to lock
Help is appreciated. Greetings