Tengo el mismo problema, @MojangSupport al abrir Minecraft marca "error al cargar datos de cuenta" y se queda abriendo infinitamente la microsoft store. (Solo deja como salida reiniciar la computadora)

Make sure you have a stable internet connection, but you'll also need to ensure that the Launcher, Microsoft Store, and Xbox Console Companion app are logged in to the same Microsoft account. If you still have trouble after that, let us know! ^AM

Problem solved, actually I had to update the launcher and the store. Then the problem got solved.