Minecraft (1.13.0) will not start after linked to child xbox account

Hello,

after I signed in the Minecraft with one of my children xbox account (to play Realms), the Minecraft never starts successfully. The account is currently set to have all security removed (meaning all settings switched to Allow or Everybody). Nobody can not play minecraft on two devices: ipad mini 2018 and iPhone SE. Same issue happended on both of them.

 

Could you please look at it? I have paid for Minecraft and Minecraft Realms to play with my kids and the result is they can't even play alone as Minecraft just doesn't start at all...

 

Thanks, Zyralt