When using ChatGPT, many users run into registration hiccups, login failures, or error code messages. This article rounds up the most common problems and their fixes, covering account creation, login issues, and API request errors—helping you get back on track quickly.
Registration & Account Linking Issues
If you don't receive the verification email during sign-up, first check your spam folder, then confirm your email address is correct. If you're using a domestic email provider like QQ or 163, consider switching to Gmail or Outlook, as some of these services may block OpenAI's verification emails.
When binding a phone number, if you see "This number cannot be used," it's because OpenAI currently doesn't support virtual or recycled numbers from certain regions. Try using a physical SIM card to register, or use a number from another country or region.
Login Failures & Account Lockouts
If you get a message like "Account under security review" or find your account locked, it's usually due to triggering the automated security rules. Common causes include frequently switching IPs, logging into multiple accounts from the same IP, or using flagged proxy nodes. The fix: stop all activity for 24–48 hours, then log in from a clean home IP.
If your password is correct but you still can't log in, try clearing your browser cache or switching to another browser. If that doesn't work, use the "Forgot password" option to reset it—this often removes a temporary lock.
