This is one of the headlines from the Boston Globe. They've revamped the state website so that when you try to schedule it sends you to a waiting room:

‘Your estimated wait time is 50,475 minutes’: State vaccine appointment site hits more snags.

Sitting waiting out the required 15 minutes. I’m in MA, been trying to schedule for a week, I guess I got lucky this morning after reloading the page a hundred times.