HTTP access authentication is a method for an HTTP user agent to provide a username and password when making a request. It is a technique for enforcing access controls to web resources because it doesn’t require cookies, session identifier and login pages. No handshakes should be performed in prediction.
The use of HTTP Authentication with cPanel/WHM is disabled, therefore the option was removed from the Tweak Settings. It was disabled in cPanel/WHM 11.42 version.
Even though it has been disabled from cPanel/WHM, you can enable HTTP Authentication by modifying /var/cpanel/cpanel.config. Add the line below
Setting it to 0 means it has been enabled.
After enabling HTTP Authentication & the pop-up will occur.