Can't have an Xbox home?

Everytime i try to choose an xbox home it says 'unable to save your changes' why is this?

:)

 

Can't have Custom Gamerpic

My account 18 years old and it says I have to be older to have a custom gamer pic

 

Have Xbox Live Gold but can't play multiplayer

Hi!

I bought a 3-month xbox live gold membership (as a physical card) from a big box store (like I always do). I entered the code and it said I have 3 months subscription added to my account, however when I tried to play multiplayer
on Halo 5 (later I tried MCC), it said that I did not have multiplayer privileges. I checked my subscriptions and it says that I have Xbox live gold until 24 April 2018. I don't know what to do, as I have signed out and signed back in as well as restarted
my xbox one. Any help would be appreciated.

 

You can change which console is your home Xbox up to three times during a one-year period. This period works on a rolling
basis, starting the moment you change your home Xbox for the first time. For example, if you make your console your home Xbox for the first time on January 1st, and then change it two more times, on February 1st and March 1st, you will not be able to change
it again until January 1st of the following year. The next time you'll be able to change it after that will be on the following February 1st, and then again on March 1st. Please make a note of the dates when you change your console to your home Xbox so that
you'll know when you can change its designation again.

When you change home consoles, all device licenses for digital content will move to your new home Xbox. These device
licenses will no longer be available on your old "home" Xbox.