To summarise for people out of the loop:

On Vatican live feed, it appears the power went out for many hours. The outside camera shows it, but also a live feed for the tomb of Pope shows no lights. The live camera also had gunshots and emergency vehicles sirens in the background. This is highly abnormal.

Many are claiming that the lights at the Vatican never went out and it's just a conspiracy.

So, either the lights went out or the live feed was faked to give the appearance of losing power (possibly to move someone in or out of the Vatican without people being able to see it).

The reason the Vatican is even being talked about is because there are rumours that the Vatican funded groups that directly rigged the US election. Italy has a screwed up political system, so individual actors or groups retain a lot of power instead of a political party. Ex, the Vatican and the Pope.

(Also, the the live stream is not pitch black. It shows other lights around the Vatican on, but not the main Vatican building)