WP_Network $current_site, string $domain, string $path )
Fires when a network can be determined but a site cannot.
At the time of this action, the only recourse is to redirect somewhere and exit. If you want to declare a particular site, do so earlier.
The network that had been determined.
The domain used to search for a site.
The path used to search for a site.
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do_action( 'ms_site_not_found', $current_site, $domain, $path );