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I am quite surprised, never having used a Nikon flashgun it was a complete guess.OK, so I've just done a test where I've deliberately taken a subject massively outside of the flash range and on the back of the flash unit itself it did flash up -3EV so it appears that @Phil V is right, so the problem that the OP had was that he was outside the flash range by at least 3 stops. I must admit, I thought they looked closer than this to me. To be 3 stops outside the flash range they'd have had to be 9.7m away.
But I don't know where you're getting the 9.7m from, are you taking the HSS into account, it eats a lot more flash power than we imagine it would.
Actually I've now seen the table, at 2.8 and 35mm and 200 ISO we only get 0.9m the way I read it, so the HSS would easily kill that
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