I can't play Minecraft realms on my Android phone

If you have an adult account, then simply go to
https://account.xbox.com/settings and sign in with the Microsoft Account email that you use for Minecraft.

The "adultness" of an account is determined by the birthdate you entered when you created that account. If you entered a wrong birthdate, and you see instructions on how to add a child account to a parent account instead of a table of settings, then you
need to create an adult account with proper birthdate, and add your child account to that adult account (to prevent children from adding their child account to a newly created "adult" account, you need a credit card to verify the age, and also a small fee
is deducted, so parents can see on their bill that someone is using their credit card for child account verification, in case the kid also got hold of the CC info).

After you added your child account at
https://account.microsoft.com/family you can then sign in the https://account.xbox.com/settings page again with the adult account, and make the necessary changes for your child
account.

For me I play Minecraft on my android phone (MCPE) My acc used to work but now when I try to sign in it says that it can't login to my account. Plz help!!!!!!

So I use the qr code to go to the website on my phone. When I put in my password it takes me to a grey screen and I can't put in the code for minecraft to access cross play and realms

Hiya Hawt,

I was very curious if there was any other method to move the content so, after looking further into this information I have found a link to support what was stated above.

Feel free to check out:
Minecraft Realms FAQ

Can I play on Realms across different devices?
"Yes! Most versions of Minecraft now allow players to get together, regardless of which device they're on. Anyone playing on Xbox One S, Xbox One X, Android, iPhone, iPad, Apple TV, Windows 10, Windows Phone, Amazon Fire tablets or Gear VR can play together.
Players of Minecraft Java Edition can currently only play with each other. "

Hope this helps.

He's not using an Xbox, it's an Xbox profile, purely for him to play Minecraft on his android phone