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.

Thanks in advance!


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