Can't use comment_form_defaults ?

add_filter( ‘comment_form_defaults’, function( $fields ) {
$fields[‘must_log_in’] = sprintf(
__( ‘<p class=”must-log-in”>
You must Register or
Login to post a comment.</p>’
),
wp_registration_url(),
wp_login_url( apply_filters( ‘the_permalink’, get_permalink() ) )
);
return $fields;
});

i want to change link or disable.