Futaba 6K setup with Naza M V2 using S.Bus issue

Has anyone setup S.Bus / D.Bus connection on the Futaba 6K with a Naza M V2 flight controller?

I can not get the Flight Control Mode to come through on any switch/channel.
X1 on the Naza comes into the Futaba on CH5 - I can assign to a 3-way switch but does not control flight modes
X2 on the Naza comes into the Futaba on CH6 - This can only be assigned to the IOC control and works fine on a 3-way switch.

Problem is I can't get the Naza "Control Mode Switch" to show up on the Futaba 6K. Any advice?
 

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