How can I know which email addres my account is in xbox

@Vortexdex
hello Hope this is Helpfull for you !

How to see your EA account email in some of our games

https://help.ea.com/en-us/help/account/find-your-ea-account-email-address-using-your-game/

To clear up any confusion,

If you NEVER played an EA game before on your Xbox Gamertag or PlayStation ID, once you load up the EA game it will prompt you to create an EA account. 

If you log into one of our games and do not get that step, it means you must have played an EA game in the past and already set up an account. The trick is to find out the email you previously set it up with that your Gamertag/PSN ID is already set up with. We have a lot of loyal customers that have been playing our games for decades now, so they might have used an email that no longer exists or simply just forgot what it was. 

To find the email you can do the following:

• Go into some of our EA games like I mentioned above to locate it. 
• Sign into Help.EA.com using your Xbox or PlayStation login credentials (there are icons for them at login). Once signed in, click on "Accounts" at the top of Help.EA.com and select Change Email. It will display the email there.
• Visit Profile.EA.com and sign in with the email you think is registered to your EA account. Once you sign in, scroll down to "Connected Accounts." If you DON'T see your Gamertag/PSN ID there, that means it's registered to a different account. 

Our Live-Support can help with account/email recovery. 

Click here to speak with an EA Advisor

What if I am having trouble linking up my Twitch account to the EA account OR linked up the Twitch account to the wrong EA account? Don't worry we've got you covered. Check out this article below.

https://help.ea.com/en/help/apex-legends/apex-legends/apex-legends-and-twitch/

*It's important to un-link from BOTH Twitch and your EA account before linking up again if you previously linked up to the wrong EA account*