SB700 using TTL passthru acts like it went off but didn't

I have a D750  with a V6 on it, then the SB700 on that.
Passthrough enabled.
Take a photo, and the SB700 acts like it went off (the red flash light starts flashing like it's recharging), but no flash happens.
When flash directly on the camera, works fine.
Ideas/suggestions/questions?

Thanks in advance!

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