For those who will have or people you know who says that their xbox hub insider is only for +18 accounts, create a new account with for birth date +18 years, re-order Sea of Thieves (Money will be removed from your account on March 20th, so just cancel the order from the old account). Then connect to the Xbox app with your new Microsoft account, install Xbox Hub Insider, connect to Microsoft, go to Insider Content, Sea of Thieves and click Join.
Sorry for my bad english, I use Google Translation :p
