The most common reason you'll see a black screen instead of the Netflix stream is due to your web browser settings. First, check your web browser settings for hardware acceleration, and then turn off hardware acceleration or toggle to deactivate it. Then, relaunch your web browser and stream.
Unlike some other Call of Duty titles, namely Warzone and Black Ops Cold War, Vanguard does not ask for a lot in terms of storage space around 50 GB including the campaign mode, as I said before. And, if you are a fan of multiplayer, you will not be disappointed since it also supports crossplay.