When you open the Minecraft game on Nintendo switch, sometimes your Microsoft account doesn't load in. It asks for you to sign in using the other device login. After you do that it still won't load for at least 20-30 times doing the other device login. After you log in succefully after like 20-30 times trying to log in the next time you open your switch it logs out again and you have to repeat that whole process to get logged back in.