Cannot sign into Microsoft account.

This issue may or may not be stated but, on the Switch and the latest Minecraft version. I can't sign into my Microsoft account. I did the instructions multiple times, but it did not work, except the first time when it did work, except the day after it signed me out, and that is when the problem occurred that I could not sign in again. Please fix this because it takes a lot from the things you can do in Minecraft.