guest

Are you sure it's a guest passkey that is set up on the console?

Here is a support page that shows how to set a guest pass, remove a guest pass, change a guest pass, and what you need to do if you forgot the guest pass:

https://beta.support.xbox.com/help/family-online-safety/passkey-guest-key/setup-guest-key-limits

You can take 2 types of guests online , i thought.

1- An account that you created on your xbox wich has to be gold for online play even as a guest.

2-or just the guest account that you should be able to select (the bottom one). should be called just guest.

with that acount you can always play as guest if the game provides guest play online.

Vat's vrong vith guest guest characters?

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.

You can't disable the guest account option but you can set up a guest key which will serve the same purpose. If you wish to know more on how to set up a guest key, please check => Set up and manage a guest key on your Xbox console | Xbox Support.