When I want to start the game (Minecraft Java edition, latest release 1.20.4), the launcher prompts for a username. When I fill in my username (that I used to use without any problems), it says that it is already in use. However, I logged on with the same account I use with that username. That doesn't work, so I try another username. That works, and when I click "Confirm", I get an error:
Failed to create profile. Make sure you are signed in to the Microsoft Store with the same account you are using to sign in to the Launcher. If you are still having trouble, try updating your profile and verifying your game ownership on Minecraft.net

I clicked on those links, and logged in. Tried again, same error. I have to say, it does work when I use Lunar Client... (Ofcourse, I am logged in on the same account)