Solved! What I did is as below:
Delete the game from Nintendo Switch.
Click the Nintendo Switch System Setting --> Data Management --> Clear all data about Minecraft from Quick Archive and Manage Software.
Download your Minecraft again, then you can log in with your Microsoft ID.
I have this problem too!!! Today is the third day already
Any update? Anyone can log in again?
same on me too! Failed login. Who can solve the problem??
I have this problem too! Please solve the problem! Mesh my day! !
Solved! What I did is as below:
Delete the game from Nintendo Switch.
Click the Nintendo Switch System Setting --> Data Management --> Clear all data about Minecraft from Quick Archive and Manage Software.
Download your Minecraft again, then you can log in with your Microsoft ID.