Realms or Multiplayer cross platform not working on minecraft

Don't worry, you can use your mobile phone too
I said PC because is more convenient, but phone works too

I dont have a pc, im using a mobile phone.

Hi and thanks for reaching Microsoft Xbox gamer's community. My name is Josef.
I'm an Independent Advisor and a Microsoft Xbox user like you.

Hope you're doing great today Bing

Are you able to change your privacy settings using the link below without no issue?
https://account.xbox.com/Settings

Or are you receive a message as soon as you sign in there?

And, may I know which troubleshooting steps you have done so far to fix this issue?

I'll be waiting for your answers, greetings from another Microsoft user!

By the way, are you part from a family group?
https://account.microsoft.com/family/home

I used to have a game pass, it expired. (Edit) Also I'm not trying to get multiplayer on realms I'm just trying to get it so I can join my friends in their world.

Thanks for the feedback Bing

Could be a bit odd but try adding a payment method on your account if you didn't have one.

Then do this :

Create a new (or use) account that can be considered as an adult account (try using another web browser or incognito mode).

Once done, add your main account as organizer via the link below. (you can see in the new account an "add member" button
https://account.microsoft.com/family/

Please double check that you select your main account as organizer too, not member.

Once successfully added, sign out from your account everywhere and restart your PC
Then log in your account again and try downloading the game.

Just to double check, please check if birthdate is more than 18 in your main account and change it if necessary
https://account.microsoft.com/profile