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Puzzling. I know they're not the same beasts but my D3 autofocuses beautifully with the TC-17 and 70-200 f/2.8 VRII even when I use ND filters and/or stop down to f/8-f/16. The simplest explanation may just be that it's defective - bad connection most likely as there are no electronics in the TC as far as I know. But I'd check on firmware updates as suggested above, too.
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Chris C.
1973 914 "R" (914-6) | track toy
2009 911 Turbo 6-speed (997.1TT) | street weapon
2021 Tesla Model 3 Performance | daily driver
2001 F150 Supercrew 4x4 | hauler
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