can not log in

Good day.

The minecraft application is installed on iPhone 6. ios 12.0

When you start the application, you can not log in to your xbox live account when you try to connect via Wi-Fi or via a megaphone cellular network. If on another iPhone with a sim card of a megaphone, turn on the modem mode and connect through it, then the entrance to the account is done. How to make the login to the account take place at any connection?