Here's a friendly guide to troubleshooting errors during Odoo reCaptcha setup:

1. Check Module Installation

Confirm the reCaptcha module is properly installed and compatible with your Odoo version.

Go to Apps, search for the module, and confirm it's installed.

If it's missing, recheck the steps to place it in the addons folder and update the app list.

2. Verify Google reCaptcha API Keys

Login to the Google reCaptcha Admin Console and confirm you've created a reCaptcha project.

Ensure you are using the correct Site Key and Secret Key in Odoo's configuration.

Copy-paste the keys carefully to avoid typos.

3. Ensure Domain is Correctly Configured

In the Google reCaptcha settings, ensure the domain (eg, www.yourwebsite.com ) matches the one registered in your Google reCaptcha project.

If you're testing locally, add localhost to the allowed domains.

4. Check Odoo Form Placement

Verify that reCaptcha is added to the correct forms (eg, login, signup, contact).

Test the form to ensure the reCaptcha widget is displayed. If it's not visible, recheck the configuration in the Website Settings or form options.

5. Review Logs and Errors

Enable Developer Mode in Odoo to check logs for error messages.

Common issues include missing API keys, conflicts with other modules, or unsupported Odoo versions.

Steps to enable developer mode:

Go to Settings > Activate Developer Mode.

Check Logs under the "Technical" menu or your server terminal output.

6. Test reCaptcha Functionality

Open the form and check if the reCaptcha widget is loading.

Submit the form to see if it validates correctly. If it fails, recheck the API key or domain setup.

7. Look for Module Conflicts

Disable other third-party modules that might interfere with forms or JavaScript.

Reactivate them one by one to isolate the conflict.

8. Update and Restart Odoo

Sometimes, restarting the Odoo server and clearing the browser cache resolves minor issues.

To restart:

Sudo Service Odoo restart

By following these steps, even can identify and fix common Odoo reCaptcha setup issues. If problems persist, consider seeking help from Odoo forums or your module provider.

If you have any doubts after looking at this then you can click here:

https://webkul.com/blog/odoo-website-captcha-log-in-lockdown/

Regards

Webkul