The pipe ( | ) and tilde ( ~ ) separators are removed from Yoast SEO plugin 17.1. It was done because Google routinely alters these symbols in search results, according to Yoast: https://yoast.com/yoast-seo-17-1

To add these separators back to yoastSEO plugin, simply add the following inside your active theme function.php file:
function wpxss_add_separator($separators){
$separators['sc-pipe'] = array(
'option' => '|',
'label' => __( 'Vertical bar', 'wordpress-seo' ),
);
return $separators;
}
add_filter('wpxss_separator_option_list', 'wptips_add_separator');
and under Search Appearance the pipe symbol will be available again:

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