Look for the account tab and select Remove Accounts.
Click on your account and remove it.
This won’t delete anything but your profile, all your games, game progress, game saves, DLCs, videos, etc. will remain intact.
So don’t panic, your stuff is safe, trust me.
After you removed the account I personally recommend clearing the system, you can skip this part if you feel like it.
To do this just open the Settings App by double tapping the Xbox Button on your controller, then scroll down to the gear icon (Settings) and Select All Settings.
Look for the Disc & Blu-ray option and then select Blu-ray
After you click the Blu-ray option you will see an option called Persistent Storage, click that and then click clear, to this 4 – 5 times.
To do this just double tap the Xbox Button on your controller, then scroll down to the gear icon (Settings) and Select Restart.
Confirm that you want to restart by clicking YES.
To do this, use your controller to Scroll left on the Home screen to open the guide, then just look for the option Add & manage and click that.
A new Window will show up, it will have a huge empty circle called Add New. Click that and enter your email address.
Make sure that you do not select Get a new account, that will delete everything on your account and will make a new one using your existing email address, so avoid that box at all costs.
If for some reason you forgot your password or email , use the buttons below, if you are totally lost, use the last button.
I hope I was able to help you out, and if you need help with anything else just check out my guides, I might have the answer for that too…
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Disclaimer, all the information included within my guides was gather via my personal experiences with my own Xbox Consoles and Xbox Live Services, Microsoft does not endorse or approve of any of my guides, if you want direct support from Microsoft or Xbox please visit the Xbox Support site or Microsoft Service Center.