reCAPTCHA ERROR: Invalid domain for site key

Question

I have implemented my reCAPTCHA in line with as is shown in the example.

I have this script in the head tag:

<script src="https://www.google.com/recaptcha/api.js"></script> 

In my form in HTML I have:

<div class="g-recaptcha" data-sitekey="my public sitekey here"></div> 

But when I load the form I get this error:

ERROR: Invalid domain for site key

I have confirmed that this is the correct site key for my domain.

The code is currently in a subdomain so I thought maybe that was the problem so I also added the subdomain to the Google reCAPTCHA admin but still get the error.

The exact same code works 100% in a different domain (with a key specific to that domain).
What could be the problem?

Answer 1

First of all, the keys are managed at https://www.google.com/recaptcha/admin#list

I ran into this error because I'm using the same key on a few different domains and I had forgotten to add one of the domains to the key.

After adding my site it took a minute or two (most likely because of cache) for things to work normally again.

Answer 2

In case someone has a similar issue. My resolution was to delete the key that was not working and got a new key for my domain. And this now works with all my sub-domains as well without having to explicitly specify them in the recaptcha admin area.