D750 compatibility with 1.4x TC

Hello. I'm a pro freelancer and have been generally happy with my D750 bodies, save for one issue: Unlike the D200s they replaced, my Nikon TC14-E II 1.4X TC and Nikon TC20-E II 2X TC no longer provide AF capability with my lenses - namely my Nikon 70-200mm f/2.8 VR1 and Nikon 300mm f/2.8 lens (non-VR). I suspect this may have to do with a focus motor difference between the two bodies...or perhaps electronics differences between my admittedly older glass and newer versions of both the TCs and/or those lenses. Just posting to see if anyone has encountered a similar issue and what my options might be, as I really miss being able to use the TCs - especially the 1.4x on the 70-200, which I've found to be a real difference-maker shooting certain sports and other events. Thanks! Mark
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