The error message you're seeing, SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data, usually means that the response you're getting isn't valid JSON. Here are a few things you can check:

Check the Response: Use your browser's developer tools to inspect the network request for the reCAPTCHA verification. Look at the response to see if it's returning an error message instead of valid JSON.

API Keys: Make sure that the new reCAPTCHA keys are correctly set up in your code. Double-check that you're using the right keys for the environment (development vs. production).

Server-Side Validation: Ensure that your server-side code is correctly handling the reCAPTCHA response. If there's an issue with how the server processes the response, it might not return valid JSON.

Check for Downtime: While it's rare, you can check if Google's reCAPTCHA service is experiencing any outages. You can look for status updates on their official status page or forums.

CORS Issues: If you're making requests from a different domain, ensure that your server is set up to handle CORS (Cross-Origin Resource Sharing) properly.

If you've checked all these and it still doesn't work, it might be helpful to consult the reCAPTCHA documentation or forums for more specific troubleshooting steps. Good luck!