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- Download and install the repair tool here.
- Let it scan your computer.
- The tool will then repair your computer.
Solution 2 – Delete your Xbox Delete profile and download it again
corrupted profile stored on your Xbox console, then download your profile again. Press the Xbox button to open the guide. Go to Profile & System Settings > > Account. Select Remove accounts.
If you’ve received an email about unusual activity on your Microsoft account, or if you’re concerned that someone else has been using your account, go to the Recent Activity page. You’ll see when your Microsoft account has been signed in in the last 30 days, as well as any device or app information.
Problems with program and account conflicts in Windows or Xbox systems are not new. It is a known fact that if applications (for example Microsoft Office) are not completely removed from the system, there is an error during reinstallation. Many users have noticed exactly the same problem with Microsoft accounts where they get the error – [email protected] is already here, another user on this device is using this Microsoft account, so you can’t add it here.
This error has been reported on Windows and Xbox consoles.
Another user of this device uses this Microsoft account
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Suppose a user creates a Microsoft account and integrates the system into it. Later, the user must create another Microsoft account and integrate it into the same system for some reason. However, the original account is generally not removed from the system registry simply because we have created a new account. This can lead to the above error.
Try the following suggestions to correct the error:
For Windows PC
1] Change local security policies
1] Press Win + R to open the Run window and enter the command secpol.msc. Press Enter to open the security policy snap-in.
2] Go to Security Settings >> Local Policies >> Security Options
In the right pane, double-click Account Policy Settings : Block Microsoft accounts to open the settings page.
4] Change the policy status to This policy is disabled in the drop-down menu, then click Apply and OK.
5] Restart the system and see if it solves the problem.
2] Using the Registry Editor
Please backup your system before continuing.
1] Press Win + R to open the Run window and type regedit. Press Enter to open the Registry Editor window.
2] Navigate to the next registry key :
HKEY_USERS.DEFAULTSoftwareMicrosoftIdentityCRLStoredIdentities
3] If you expand the registry key StoredIdentities, you will find the Microsoft accounts embedded in the system. You can right-click the account you do not need and delete it 
.
4] Restart your system. I’m sure that will solve your problem.
For Xbox
If you receive this error message Another user of this device is using this Microsoft account while you are trying to add a new account to your Xbox console, we must delete the previous account.
1] Press the Xbox button to open the Xbox Guide.
2] Go to Settings > All Settings > Accounts.
3] Click Delete Accounts.
4] Select and delete your old account. Make sure all redundant accounts are removed before restarting the console.
After restarting the console, add your new accounts.
Best wishes!
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