If you're encountering an issue where Lancet Labs indicates that your login details are registered to another user, despite attempting to change your password with a PIN, follow these steps to troubleshoot and resolve the problem:

1. Verify Your Email Address: Ensure you are using the correct email associated with your Lancet Labs account. Often, users may have multiple email addresses, leading to confusion.

2. Check for Typos: Double-check for any typographical errors in your login details. This includes your email address and password.

3. Alternative Login Attempt:
- If you have access to multiple accounts under different email addresses, try logging in with these variations.
- Use the "Forgot Password" feature again to reset your password for the correct account, ensuring you enter the email initially registered.

4. Clear Browser Cache:
- Sometimes, cached data can lead to login issues. Clear your browser’s cache and cookies and then attempt to log in again.
- Instructions for clearing cache vary by browser; generally, you can find this option in your browser’s settings under "Privacy" or "History."

5. Try a Different Browser: If issues persist, attempt to access your account using an alternative web browser to see if the problem is browser-related.

6. Contact Customer Support: If none of the above steps work, reaching out directly to Lancet Labs customer support is necessary. Provide detailed information about the issue, including:
- The email address you are using to log in
- The PIN you received (if applicable)
- Any error messages you are receiving

They can assist you more effectively, especially if there's a mix-up with your account.

7. Review Any Recent Changes: If you have shared your login details or if someone else may have access to your account, consider reviewing recent changes and securing your account.

Following these steps should help you resolve the issue with your Lancet Labs login. If you need further assistance, do not hesitate to contact their support team for more personalized help - [learn more].