Xbox Live is having problems staying up today. I don't have my Series X yet (it's scheduled for delivery) but I was unable to log into my Xbox One X to watch video earlier.
Both Microsoft and Sony are pushing digital only versions of these boxes, and now people are going to have problems getting any games on them. Apparently people who already have games are also unable to play them because they can't authenticate. It's a mess that will hopefully be ironed out...but it shouldn't happen. The pre-order mess was one thing, but Microsoft is a leader in web services, which represents about a third of their revenue. We think of Microsoft as the Windows/Office/Xbox company, but the reason it is still one of the Big Five is that it actually does a ton of web-hosting and server software stuff, which is where basically all the company's growth has been recently.
Now maybe this was a massive DDOS attack, though they should be prepared for that too, and in the end I'm sure they'll sort it out relatively quickly, but it's still very strange that this keeps happening.
If you want to sell consoles that require Internet connections and can only get games via download then your Internet services just have to work basically all the time and at the very least on launch day. For people who can't get into Xbox Live right now the Series S is a $300 paperweight, and even some people with an X can't do anything on theirs even if they do own physical games for it.