Can't log in Xbox account in Minecraft

I wanna log in xbox in minecraft,but that will exit game.

 

1.open minecraft

2.click log in

3.Then automatically quit the game

So how i can log in?

Even I delete it and download again, I can’t log in. I tried to delete any information about Minecraft and reset the phone,that can't aslo be resolved.

But before performing the above actions,when I opened the game, although I kept logged in, I couldn't play with my friends. The server page just had an "coming soon", and opening the market was empty. I couldn't log out at that time, so I did the above mentioned behavior.