You have a space in your function name on the action call,
add_action( 'wp_ajax_nopriv_ MyAjaxFunction', 'MyAjaxFunction' );
add_action( 'wp_ajax_ MyAjaxFunction', 'MyAjaxFunction' );
…should be,
add_action( 'wp_ajax_nopriv_MyAjaxFunction', 'MyAjaxFunction' );
add_action( 'wp_ajax_MyAjaxFunction', 'MyAjaxFunction' );
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