Please can you raise a service request via Supportnet for this issue and one of our local experts will pick it up, and work with you directly.
I worked with the Boeing focal, Rick Traversy, and got it all working. It was actually quite a process and differed greatly from the MG site recommendations.
I would recommend any requests from Boeing be redirected to Rick.
787 Flight Control Interfaces Lead
(ICD, Wiring, Act'n Data Bus, Electronic Ckt. Bkrs, Schematics, DMDT)