So it has been reposted multiple times and reiterated by multiple conservative pundits that there was a Vatican blackout.
Now, I wish this was true but there is a large possibility that it was simply camera exposure problem.
https://youtu.be/wMbmhlGqJHI?t=210
If you look at this video then you will see at the bottom left there is a car, it is dark now but after a couple of seconds everything turns back on... Including the car.
If it was truly a blackout, why did the car turn back on too?
It's definitely a camera issue. There would be ambient light visible if it was a black out, instead it looks like the ISO is set way too low.
But... the exposure changes immediately, like it was manually set. Cameras don't automatically adjust themselves like that.