reCAPTCHA ERROR: Invalid domain for site key

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.

I had the same problems I solved it. I went to https://www.google.com/recaptcha/admin and clicked on the domain and then went to key settings at the bottom.

There I disabled the the option below Domain Name Validation Verify the origin of reCAPTCHA solution

clicked on save and captcha started working.

I think this has to do with way the server is setup. I am on a shared hosting and just was transferred without notice from Liquidweb to Deluxehosting(as the former sold their share hosting to the latter) and have been having such problems with many issues. I think in this case google is checking the server but it is identifying as shared server name and not my domain. When i uncheck the "verify origin" it starts working. Hope this helps solve the problem for the time being.

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.