The security check prevents you from accessing your account

the security check prevents you from accessing your account because you don't receive the confirmation code, see this article to find out why you don't receive it.

In case you've received the code, but you still can't access your account, try clearing your browser's cache and cookies and try signing in again.

If the login issue persists, try reporting the issue to Facebook using this dedicated form. Alternatively, follow the steps in this article to start the recovery process of your Facebook account.