Update User Meta after Registration - php

Question

In wordpress, after a user registers, I am using the function below to create two pages of two different custom post types, and I then need to store a custom meta value in their user data to assist with redirects later. I've found that if I specify custom meta values during registration (on registration form), I can retrieve these values later with :
global $current_user;
get_currentuserinfo();
$theirRedirectKey = $current_user->rpr_redirect_key;
However, in the following functions.php snippet, I can't the meta value to save for retrieval later.
function after_registration($user_id){
// Get the Newly Created User ID
$the_user = get_userdata($user_id);
// Get the Newly Created User Name
$new_user_name = $the_user->user_login;
// Create a unique Tour Code Prefix from User ID
$tourPrefix = $the_user->ID;
// Check for Tour Code Key if entered into registration form
$enteredKey = $the_user->rpr_redirect_key;
if($enteredKey == ''){
//Create the first Tour Builder Page
$tourBuilder = array();
$tourBuilder['post_title'] = $new_user_name . '| Custom Educational Tour';
// Next line may not be important after hubpages are set up.
$tourBuilder['post_name'] = 'builder-' . $tourPrefix;
$tourBuilder['post_type'] = 'builder';
$tourBuilder['post_content'] = 'This is the content!';
$tourBuilder['post_author'] = $user_id;
$tourBuilder['post_status'] = 'publish';
$tour_id = wp_insert_post( $tourBuilder );
// Build hubpage
$hubpage = array();
$hubpage['post_title'] = $new_user_name . '\'s Hubpage';
// URL must be unique
$hubpage['post_name'] = $new_user_name;
$hubpage['post_type'] = 'hubpages';
$hubpage['post_author'] = $user_id;
$hubpage['post_status'] = 'publish';
$hub_id = wp_insert_post( $hubpage );
//Update User with proper redirect keys for some reason this line doesn't work.
add_user_meta($the_user, 'rpr_redirect_key', '/hubpage/' . $new_user_name, true);
}
}
add_action('user_register', 'after_registration');
Help would be much appreciated.

Answer 1

In the line
add_user_meta( $the_user, 'rpr_redirect_key', '/hubpage/' . $new_user_name, true);
$the_user isn't the ID. Try $the_user->ID or $user_id instead