A proxy acts as a middleman between you and the website.
To regain access immediately, use the Yahoo Sign-in Helper. You will need to verify your identity via a recovery phone number or alternate email address. yahoo unblock
If your account was deactivated due to inactivity (usually after 12 months), you can often reactivate it by signing in and following the verification prompts, provided the account hasn't been permanently deleted. Accessing Yahoo on Restricted Networks A proxy acts as a middleman between you and the website