private function enroll_users_in_product() {

		// Get user information from user ids.
		$users = $this->get_users( $this->user_ids );

		// Bail if for some reason, no users are found (because they were deleted in the bg?).
		if ( empty( $users ) ) {
			$message = sprintf( __( 'No such users found. Cannot enroll into <em>%s</em>.', 'lifterlms' ), $this->product_title );
			$this->generate_notice( 'error', $message );
			return;
		}

		// Create manual enrollment trigger.
		$trigger = 'admin_' . get_current_user_id();

		foreach ( $users as $user ) {

			$this->enroll( $user, $trigger );
		}
	}