To protect your privacy, we "block" secure areas of Yahoo! when:
We do this to help prevent others from breaking into your sensitive data.
If your account is blocked, you need to request a new security key to re-activate your account.
On the screen that says your secure account has been blocked, follow the instructions to request a new security key.
Note: When your secure account is blocked, only areas protected by a security key are inaccessible. You can still use your Yahoo! ID and password to access all other features of Yahoo! (such as My Yahoo!, Yahoo! Mail, and Yahoo! Chat)