Christian Daniel Lewis

Oh, sorry.
I hadn't realized that the update had rolled out for the iOS devices.
Yes, I beleive that a swipe would be as much of a close as you can get without a third party app.
The other steps should be unhindered by this lack of a feature.

Tom, please try these steps:
1. Go into settings>applications>minecraft and force stop the application.
2. Make sure your device is connected to wifi that is able to connect to the internet.
3. Start the app Minecraft PE and wait for one full minute without doing anything.
If, during this minute, the button that says, "Sign In" turns into a button that has a person with a speech bubble, click Settings, then check if your gamertag shows in the settings.
4. If, after a minute, it does not change, click on Sign In and proceed to sign in.
5. After signing in, if you get the error message, close the app (no need to force stop it), and repeat step 3.
If it doesn't work after those steps, please report back here to tell us this.
Thank you Tom! Hope this works for you!

I am having the same issue... Error message is: We tried to sign you into your xbox live account, but something went wrong. I am on a Samsung Galaxy S6 running Android Marshmellow with the beta version downloaded through Google Play...

I am having the same issue... Error message is: We tried to sign you into your xbox live account, but something went wrong. I am on a Samsung Galaxy S6 running Android Marshmellow with the beta version downloaded through Google Play...