When passing through the Captcha page, the visitor sees an invalid "is protected by Imunify360" message:
The problem has been confirmed by the developers and a fix will be available in a future WebShield release (id DEF-22600 can be tracked for this issue in the changelog).
As a temporary workaround, the following line can be added to the file /usr/share/imunify360-webshield/captcha/templates/index.html:
An example of how to add it is in the screenshot below:
Afterward, it is necessary to restart WebShield:
systemctl restart imunify360-webshield
And the problem with the Captcha page on the server will be fixed.