Why cant I add an account on my xbox one?

Have you tried performing a power cycle on your console?

1. Turn off your console by holding the Xboxbutton on the front of the console for approximately 10 seconds. The console will turn off.

1. Turn your console back on by pressing the Xbox button on the console or the Xboxbutton on your controller.
   
   Note If you don't see the green boot-up animation when the console restarts, repeat these steps. Make sure that you hold the power button until the console completely shuts down.

Important If your console is in Instant-On power mode, the above steps will shut the console completely off. Instant-On mode, or the ability to turn on your console by saying "Xbox on," won't be enabled until you restart the console.

Hi!

Maybe this helps

https://support.xbox.com/en-US/my-account/manage-gamertag-and-profile/add-remove-account-xbox-one

https://support.xbox.com/en-US/xbox-one/errors/error-code-80a40002

You have said that you factory reset the console correct?

You can try to do a system reinstall.

For a detailed guide, please use this link: https://support.xbox.com/help/hardware-network/console/reset-console-to-factory-defaults

It's a two-step process using a computer and your console, I highly recommend you use the above link for a better reading experience.

If you prefer a step-by-step guide here, please, follow these steps:

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First Step (On the Computer):
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Plug your USB flash drive into a USB port on your computer.

Select the following link to download the reset file to your compute: https://www.xbox.com/xboxone/restorefactorydefaults

Select Save to save the console update.zip file to your computer (if it doesn't download automatically).

To unzip the compressed file, right-click on the file and then select Extract all from the pop-up menu.

Copy the $SystemUpdate file from the .zip file to your USB flash drive

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Second Step (On your console):
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Unplug the network cable if you're using a wired network connection.

Power off your console, and then unplug the power cord to ensure that the console is completely powered off.

Wait 30 seconds, and then plug the power cord back in.

Plug the flash drive into a USB port on your console. For more information, see:

Press and hold the Pair button (Xbox Series X|S: located on the front next to the USB port) and the Eject button (Xbox Series X: located just above the disk drive slot), and then press the Xbox button on the console.

Note The Xbox Series S and the Xbox One S All-Digital Edition do not have an Eject button. On this console, you only need to hold the Pair button and then press the Xbox button.

Continue holding the Pair button and Eject button for 10-15 seconds.

Listen for two "power-up" tones a couple of seconds apart.

You can release the Pair button and Eject button after the second power-up tone.

When the console restarts, remove the flash drive.

Once the console restarts, you should see the digital setup experience to guide you through resetting your console.

Let me know if it works!

Hi Riley, my name is Rodrigo. I'm an Independent Advisor and a member of the Microsoft community and I'd love to assist you today.

I am sorry to hear that.

Please, try power cicling the console.

To do it, follow these steps:

Turn off your console by pressing the Xbox button on the front of the console for about 10 seconds, until it shuts down completely.

Unplug the console's power cable. Wait 10 seconds.

Important Be sure to wait at least 10 seconds. This step resets the power supply.

Plug the console power cable back in.

Press the Xbox button on your console to turn it on.

For more information: https://support.xbox.com/help/hardware-network/power/restart-or-power-cycle-console

Let me know if it works!

Ive tried this and ive tried many different methods but nothings working. Ive unplugged the console completely overnight aswell and still nothing