Add info on domain error

src/content/docs/en/basics/faq.mdx

@@ -3,15 +3,21 @@ title: Frequently Asked Questions
 i18nReady: true
 ---
 
-## What does Site Key not Registered mean?
+## What does `Site Key not Registered` mean?
 You may encounter this error when you set up the Procaptcha widget on your website. This error occurs when the site key
 you are using is not registered in the Prosopo system. To resolve this error, click the Activation link in the email
 or <a href="mailto:[email protected]">contact the Prosopo support team</a>.
 
-## What does Invalid Site Key mean?
+## What does `Invalid Site Key` mean?
 This error occurs when the site key you are using is not valid. To resolve this error, ensure that you are using the
 correct site key, which you can find by logging in to the [Prosopo portal](https://portal.prosopo.io).
 
-## What does Error parsing captcha mean?
+## What does `Unauthorized origin URL` mean?
+This error occurs when the domain of the site key does not match the domain of the website where the Procaptcha widget
+is being used. To resolve this error, ensure that the domain of the site key matches the domain of the website by
+logging in to the [Prosopo portal](https://portal.prosopo.io) and updating the domain.
+
+## What does `Error parsing captcha` mean?
 This error will occur if incorrect data has been sent with the captcha response. To resolve this error, ensure that the
 data sent with the captcha response is correct.
+