I logged back into Minecraft after migrating my account, when I tried to join a server it just gave me an error message saying "Failed to login: null". I've done the only steps that could solve this problem, deleting all Mojang related off the notepad and enabling all settings on xBox. After that, the person who was helping me with this issue suggested that I had a bug in my game and referred me to this website to report it. Its not just happening to me in 1.17.1 though, 1.8.9 too.