I’ve been flying the a321NEO around on Live mode, and today when I tried to resume my flight, the aircraft was fully powered off, it kept telling me to boost the fuel pumps.
On the engine display screen where it says FOB, which it means “fuel on board”, it say 0 kg. Most likely you ran out of fuel.
Ahh you’re right, not sure how that happened though? I had imported my weights from simbrief and given myself +1hr 30 of fuel
I never had that happened to me before but I also dont use simbrief, I use flight aware and add 1 or 2 hrs to whatever the flight time is.
Autopilot+ is highly unreliable for fuel burn.
That’s what I was thinking lmao
His Fuel Used also shows 0 
I think it’s just AP+ as others already said. I use Simbrief too and have never had this happen.