My reCAPTCHA V3 still saying its missing something

It sounds like you completed the frontend half of the integration

https://docs.cloud.google.com/recaptcha/docs/instrument-web-pages

The other half of the integration is in the backend, namely calling the CreateAssessment endpoint.

https://docs.cloud.google.com/recaptcha/docs/create-assessment-website

Or is this reCAPTCHA integration through some kind of plugin in a website builder?

Please note that the secret key is sensitive (similar to an API key) and should not be shared. I would suggest editing your post to remove this, and to be safe I would also just create a new reCAPTCHA key just in case.

Is it not just a case of putting in the site key and secret key? I find those help documents extremely difficult to understand. 

The reCAPTCHA is in the elementor setting, all you have to do I thought is add the site and secret key.

I will remove it, but can you help me set up a new one?

I don’t know a lot about how Elementor integrates reCAPTCHA as they are not associated with Google.

They include the following note

Note

Elementor and reCAPTCHA integration does not support the Enterprise version of Google’s reCAPTCHA API.

Therefore that means they are not calling the enterprise endpoint https://recaptchaenterprise.googleapis.com instead they are calling the legacy endpoint https://www.google.com/recaptcha/api/siteverify

Calls to the /siteverify endpoint will not be visible in the GCP Cloud Console that you included in your screenshot above.

To generate a new reCAPTCHA key you can follow the steps they enumerated in the Elementor docs https://elementor.com/help/recaptcha-elementor-integration/

Is there a difference in using the elementor reCAPTCHA and the Enterprise version?

It seems that elementor is integrating with the “Classic” reCAPTCHA version (the /siteverify endpoint) instead of the Enterprise version. They would use the following guide to migrate to the new integration type

https://docs.cloud.google.com/recaptcha/docs/migrate-recaptcha

Since this seems to be abstracted from elementor users it does not seem that there is any particular action you can take here to change the reCAPTCHA integration type.