Signing In and Guest Key Problems

If you are referring to the guest key, check this out:
support.xbox.com/.../forgot-guest-key

A forgotten guest key can be reset by any adult as long as that person knows the password that they use to sign in to their Microsoft account on the console. The adult must be signed in on the console to reset the guest key.

Hello Chris, My name is Jesse. I'm an Independent Advisor and a member of the Microsoft community and I'd love to assist you today.

Please see the steps on how to reset your guest key here https://support.xbox.com/en-US/help/family-onli...

Hope this helps.

A forgotten guest key can be reset by any adult, as long as that person knows their Microsoft account password and is signed in on the console.

1. Follow the steps to remove a guest key.
   
2. When you’re prompted to enter the guest key, enter an incorrect key three times, and then enter your Microsoft account password to remove the guest key.
   
3. If you want to create a new guest key, select Create a guest key and follow the steps.
   

In your case, since you deleted your Microsoft account, I would recommend creating a new one as that would be the only option!

Hello there,

Thank you for posting here on the Xbox forums. The "Guest key" feature is used to allow people access to content while nobody is signed in. It is not used in the way you are describing. Unfortunately, it is not for "Signing in as a guest." Check out this
link for more information on what the Guest key is used for, and what limits can be set :

Set up a guest key and limits on your Xbox One console.

Hi MARCOLAGAMES!

You also have the option to setup a Guest Account or Keys on your xbox.

When you have a guest who wants to play side-by-side multiplayer games but doesn’t have an Xbox Live account or gamertag, you can create a guest account on your Xbox One console for one-time use. This temporary
account is created as a copy of the account of the person who’s currently signed in to the console.

At the end of the session, when the person whose account was used to create the guest account signs out, the guest account is also signed out and removed from the console.

Note A guest account is different from a guest key. A temporary guest account can only be created while you’re signed in and is deleted as soon as you or your guest signs out. A guest key is
a reusable passcode that allows guests to use your console without requiring you to be signed in.

https://support.xbox.com/en-US/my-account/security/use-guest-account

Guest Key solution: https://support.xbox.com/en-US/my-account/security/setup-guest-key-limits

Maybe that can be a legal workaround for your situation.

Hope this helps!

Happy Gaming!

PSA for the Ambassadors: this was taken directly per quotes from xbox support forum guidelines, this does not violate any terms and services agreement.