Muhammad,
Multisite uses the same code in most cases. If you look at the function https://developer.wordpress.org/reference/functions/wp_new_user_notification/, you’ll see that there are filters to change the ‘message’, such as
‘wp_new_user_notification_email_admin’ and
‘wp_new_user_notification_email’.
You’ll see the code includes link to “network_site_url” allowing for a new ms user.
A good way to teach oneself these things is to have multisite on a localhost, then you can tracks, search, explore the code and verify what functions are executing and see what filters are being applied and actions being ‘done’.
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