CB-antispam

Hello,
I bought and installed the antispam plugin for CB. It's enabled at the place of the Joomla antispam plugin. I created a V3 key and added the site key and the secret key. But if we try to log in on the front, we receive a message : The response parameter is invalid or malformed.
Joomla 5.1.2
CB antispam 6.1.0
I deleted the key and re-created a new one, but nothing changes, impossible to connect.
I tried on a staging website and the complete error is : Client error: `POST www.google.com/recaptcha/api/siteverify ` resulted in a `400 Bad Request` response: { "success": false, "error-codes": [ "invalid-input-response" ] }
Could you help me ?
Thanks a lot !

Where exactly did you add your site key? It should be added to CB AntiSpam > Configuration > Parameters > Modes > reCaptcha > v3. Next be sure under the Captcha > General tab you've selected reCaptcha v3.

Note for legacy login captcha to work you must use CBs login module and your login module must be configured to load plugins. To be sure your login module is loading plugins edit it under Content > Site Modules then under "Login and Logout Options" ensure "CB Plugins integration" is set to "Yes".