Please help, multiple emails used

I tried that and it says

This email address is already taken. Please try another.

when my parents added me to their office 365 they used my main email address (gmail)

Is there a way to delete the outlook one linked to my xbox altogether and only have my gmail email on the xbox?

Hello, first it's a pleasure to be able to help you today.

My name is welcome to the community.

Hello Lachlan, by your description you want to do an "Alias" in your account, but for this will have to try to do by Microsoft account, in case would put the Gmail account as Main Alias and leaves Microsoft as secondary or deletes it, which I do not remake.

Add or remove an email alias in Outlook.com

https://support.microsoft.com/en-us/office/add-...

For help with that offer, you'll need to fill out the form on the bottom of the offer's FAQ -

microsoft.promo.eprize.com/.../faq.html

Thank you for reaching out to me

And yes i’ve thought of that but the only problem is there’s a specific gamertag that i chose which I should have mentioned. This gamertag was the gamertag that I wanted. The only solution I Found was to change my gamertag and create a whole new account
to acquire it again

but i really don’t want to spend 10 bucks to do that

i dont have the money

is there another way ??????

Hey there Dee thanks for keeping in touch.

We suggest looking into the
Microsoft Account Alias page to perhaps remove the email from the account and replace it with the correct email. Since this can get a bit confusing we suggest to
Request a Callbackfrom
one of our Xbox Support Specialists since they are the best equipped, tool wise, to walk through this in a step by step basis. Give it a shot and let us know how it goes