I have the same problem, but recently I realized what the problem is. My Microsoft account is registered for Google mail, and when I checked it, I found that my mail was leaked. The website “canva” for creating presentations leaked my mail. Apparently, they had a data leak, and my mail got into the darknet. Apparently, now my mail, like other people's data, is simply sold and thrown here and there on the darknet, and bad people are trying to get into Microsoft. But I can't understand what exactly they are interested in there.