remove_meta_box issue!

Hi guys – I run into a problem trying to get remove_meta_box() to work

/** remove metabox for catchkathmandu options
	 */
	function vpm_remove_meta_box() {
		remove_meta_box( 'catchkathmandu-options', 'post', 'normal' );
		remove_meta_box( 'authordiv' , 'page' , 'normal' ); //removes author
	}
	add_action( 'add_meta_boxes', 'vpm_remove_meta_box' );

The point is I dont want contributors and authors to edit the site design, so I wanted to remove the catchkathmandu-options. the code obviously does not reflect the condition, the codex for this function supplies the solutions for that but this code at the besic step, still isnt working – I switched back to Twenty Sixteen theme and put in the authordiv section simply to test. But still no dice.

Have I taken the wrong path and am I looking at the wrong thing entirely?

Any help appreciated!