Google reCAPTCHA V3.0 not working. "ERROR for site owner: Invalid key type"

Also, this error will occur if the version (V2 or V3) you have created on the Google reCAPTCHA admin page here is different than the one you specify in your CDN admin panel (such as Wordpress, Squarespace, etc.).

Meaning, if you created a V2 reCAPTCHA in Google reCAPTCHA admin, the keys will be different than if you created a V3. Notice the version on left side. Thus, specifying V3 in the CDN (ie: Wordpress) admin panel of a reCAPTCHA plugin on your site, like shown here , will give 'key type' error. Notice the version options below the keys. Version created in Google must match plugin settings.

Downgrade to V2. For some reason. it works for me.

Squarespace form blocks do not support reCAPTCHA V3.0 Site or Secret Keys at the moment. Must stick with V2.0 Keys for the time being.