Hi Chris,
I will be sharing the code in next 3-4 working days. Need some time to put it.

I won’t be able to share it for existing users. To be honest, For existing users or larger number of users, this needs to be done as plugin where we move the processing of search/adding in background queue and need to manage multiple queues(for existing users).

Due to time constraint, I will share the code which won’t be using background processing. Should work fine for smaller number of users though.

Regards
Brajesh

Hi Chris,
Thank you for the patience.

Here is the code to add all users from same domain as friend. It adds them as friend when a user account is activated.

/**
 * Add users from same domain as friend on account activation.
 *
 * @param int $user_id user id.
 */
function buddydev_add_friends_on_activation_by_email_domain( $user_id ) {

	$user = get_user_by( 'id', $user_id );
	if ( ! $user ) {
		return;
	}

	$email_parts = explode( '@', $user->user_email );

	if ( count( $email_parts ) !== 2 ) {
		return;
	}

	$domain = $email_parts[1];

	$potential_friend_ids = buddydev_get_users_with_email_domain( $domain );

	if ( empty( $potential_friend_ids ) ) {
		return;
	}

	foreach ( $potential_friend_ids as $potential_friend_id ) {

		if ( $potential_friend_id == $user_id || friends_check_friendship( $user_id, $potential_friend_id ) ) {
			continue;
		}

		friends_add_friend( $potential_friend_id, $user_id, true );
	}

}

add_action( 'bp_core_activated_user', 'buddydev_add_friends_on_activation_by_email_domain' );

/**
 * Get all users who have given email domain.
 *
 * @param string $domain domain name.
 *
 * @return array
 */
function buddydev_get_users_with_email_domain( $domain ) {
	global $wpdb;

	$pattern       = '%@' . trim( $domain );
	$sql_statement = $wpdb->prepare( "SELECT ID FROM {$wpdb->users} WHERE user_email LIKE %s", esc_sql( $pattern ) );

	return $wpdb->get_col( $sql_statement );
}

I am not sharing the code for the member type since BuddyPress does not set member type on activation and BuddyBoss does set it but that is not straight forward(or guaranteed and depends on settings).

Regards
Brajesh