@sbaksh
Thank you for details you provided.
It seems you tried to search plugin’s widgets in the Elementor sidebar. But it is known problem, when you can not find in the Elementor sidebar any WordPress widget through their search field. It seems Elementor’s developers restricted this option for the purposes of competitive struggle.
But you always can scroll down sidebar to the WORDPRESS section and select the Filter Everything’s widgets manually. Please, see screenshot – https://prnt.sc/KgOl4IfzZPYf
Unfortunately it is prohibited here on WordPress forum to share site credentials and in case of that moderator can close this topic and punish its members.
Please, let me know if it was helpful for you.
Thank you. Regards.