Waiting for datacenters in Warzone 2.0 or Modern Warfare 2? You're not the only one

Have you got home from work today eager to try Warzone 2.0 – the latest battle royale experiment from Call of Duty, Raven, Infinity Ward, and Activision? Have you been met with an infuriating pop-up when you've first tried to log in, telling you that you cannot play because your game client is 'waiting for datacenters'? Well, you're not the only one. The problem is widespread. I'm writing this right now as my Xbox Series X tries to make a connection to the Activision servers via Modern Warfare...