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do_action( 'wpmu_activate_blog', int $blog_id, int $user_id, int $password, string $signup_title, array $meta )

Fires immediately after a site is activated.

$blog_id: (int) Blog ID.
$user_id: (int) User ID.
$password: (int) User password.
$signup_title: (string) Site title.
$meta: (array) Signup meta data. By default, contains the requested privacy setting and lang_id.

Used By	Description
wp-includes/ms-functions.php: wpmu_activate_signup()	Activate a signup.

Version	Description
MU (3.0.0)	Introduced.

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