cannot sign in with my game name only as a guest.

Hi there and thanks for the response.

The issue is not restricting access to games, I know how to do that. Instead there are currently games they can access without signing in to their account, they are effectively playing as a guest. Hence, I cannot restrict them as the ability to restrict is linked to their user name.

Thank you for enquiring my question however my issue is that i cannot sign into an adult account on the xbox which is required to change or remove a guest key- and i cannot access the guest key because iv forgotten it which is required to add an adult
account.

Yeah...I am not too sure what you mean by "guest account". The only time I have ever seen that is on games that support the "guest" option on Xbox Live. In games that do (like the Halos) when you start an online game, you sign in with your Gold sub. Other
players can sign on the same console and play online with you via the "guest account": they sign in under the "guest" option. They will then show onscreen as (your GT)1, 2, 3. This is the only time I have ever seen the "guest account". And no, you can't
delete it. As stated above, it only shows up on games that support it. And then it only shows up in the sign-in process for players on the same console as you.

No profile 2 wouldnt be able to use on console one unless profile one is signed in online and profile 2 would be a guest and cannot get acheivements

Only profile 1 can roaming with any purchased game or dlc

So are they signing in as a guest account to circumvent screen time?

If so, you can put a pass key that only you know so they cannot do that. You can also restrict features that way if they were to use a guest account.

This should help you stop them from doing it. Please have a read through the link below.

https://support.xbox.com/en-IE/my-account/security/setup-guest-key-limits