Verified accounts

I would try to contact an Xbox Support customer rep (phone/chat) to see if they can help sort your account out.

Phone (US/CAN): 1-800-4MY-XBOX

Chat: https://support.xbox.com/contact-us

Hey Sailorrob42, I'm sorry to hear about your problem. Please try the following solutions to fix your problem.
Solution:

• Delete your profile from your Xbox 360 Console (Profile only, NOT profile and all items)
  
• Re-download your profile
  

Solution 2:

• Check if your account information is correct and filled out completely, this includes your security info. You can do this
  Here.

See if this works out for you. Regards, SamxBroski

You can try the options you feel comfortable with until the issue gets solved, also, if you are not the administrator of the Pc you should contact him

Hey, no further information is given. It is just asks my code, I put it in, I press verify and a new window, exactly the same opens up. This keeps looping but no error code or info...

Hi KB_495, 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 truly am sorry to hear that.

Please try all the troubleshoot available here: https://support.xbox.com/help/account-profile/manage-account/lost-password-solution">https://support.xbox.com/help/account-profile/manage-account/lost-password-solution

Keep in mind that, without access to your recovery e-mail and/or phone number (2FA), it is not possible to recover the account.

Please, read this:

"Microsoft takes your security very seriously, and to protect customer privacy we can only help customers verify their account ownership through the online password recovery process.

If you remember any new details that might help with the recovery process, we encourage you to keep trying to recover your account using the online account recovery form.

You might also want to create a new account at this point."

Source: https://support.xbox.com/help/account-profile/manage-account/lost-password-solution

I hope this helps!