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do_action( 'added_existing_user', int $user_id, true|WP_Error $result )

Fires immediately after an existing user is added to a site.

$user_id: (int) User ID.
$result: (true|WP_Error) True on success or a WP_Error object if the user doesn't exist or could not be added.

Used By	Description
wp-includes/ms-functions.php: add_existing_user_to_blog()	Add a user to a blog based on details from maybe_add_existing_user_to_blog().

Version	Description
MU (3.0.0)	Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/hooks/added_existing_user