My launcher said it had an update today, so I restarted it and let it install the update. When it started back up, it logged me out, so I tried to log back in. I clicked Microsoft Login, and then the Microsoft Store popped up and started loading something, stopping the animation of the loading symbol and restarting it, sometimes showing the screen for Gaming Services for one frame then showing the loading symbol again. All of that without showing me the screen to log into my Microsoft account. When I try to focus on another window, it re-focuses on the Microsoft Store window, basically forcing me to open Task Manager and kill the launcher. When I did that, Microsoft Store became normal again, which means the launcher is at fault. I have no idea if this is a bug, but I'm reporting it in case it is.

Edit: it turns out this is an issue with Gaming Services. I found this thread that fixed my issue.