I was struggling to get the ReCaptcha validated in the second step for a Sitecore 10.4 implementation. We needed a new key and once the domain was added to the new key, it kept throwing an error when I would try to use Postman. Since I did not have access to the Developer Console I had to get creative.

Available for download is a simple webpage where you can add in your Site Key, API Key, and Project ID so that you can complete the second step of validation