Get Site Path From Shortcode

I am trying to get a custom shortcode to work from a network site.

Whenever I use network_site_url(). it just returns https://example.com and this is not correct. It should be https://example.com/mysite/.

This is literally all my shortcode contains right now.

function testwiki( $atts ) { echo network_site_url(); }
add_shortcode( 'testwiki', 'testwiki' );