Google Oauth2 API - No Refresh Token - oauth-2.0

Question

I have attempted many solutions provided on Stack Exchange to obtain a refresh token, and they all fail. Below is my whole controller. As you can see, I have included $client->setAccessType('offline') and $client->setApprovalPrompt('force').
In addition, I have ran the revoke token many times, and I have gone into my Google Account here (https://myaccount.google.com/permissions), and removed access. None of these attempts provided me with a refresh token when I made a new authorization.
<?php
/**
* #file
* Contains \Drupal\hello\GAOauthController.
*/
namespace Drupal\ga_reports_per_user\Controller;
use Drupal\Core\Controller\ControllerBase;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Drupal\Core\Routing\TrustedRedirectResponse;
use Google_Client;
use Google_Service_Analytics;
use Drupal\group\Context\GroupRouteContextTrait;
class GAOauthController extends ControllerBase {
use GroupRouteContextTrait;
public function authorize($group = NULL) {
$client = new Google_Client();
$credentials_file = \Drupal::service('file_system')->realpath("private://") . '/client_credentials.json';
$client->setAuthConfig($credentials_file);
$client->addScope(Google_Service_Analytics::ANALYTICS_READONLY);
if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off') {
$protocol = "https";
}
else {
$protocol = "http";
}
$redirect_uri = $protocol . '://' . $_SERVER['HTTP_HOST'] . '/finish_google_oauth';
$client->setState($group);
$client->setRedirectUri($redirect_uri);
$client->setAccessType('offline');
$client->setApprovalPrompt('force');
$auth_url = $client->createAuthUrl();
return new TrustedRedirectResponse($auth_url);
}
public function finishOauth() {
if (isset($_GET['code'])) {
$client = new Google_Client();
$credentials_file = \Drupal::service('file_system')->realpath("private://") . '/client_credentials.json';
$client->setAuthConfig($credentials_file);
$client->addScope(Google_Service_Analytics::ANALYTICS_READONLY);
if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off') {
$protocol = "https";
}
else {
$protocol = "http";
}
$redirect_uri = $protocol . '://' . $_SERVER['HTTP_HOST'] . '/finish_google_oauth';
$client->setRedirectUri($redirect_uri);
$client->setAccessType('offline');
$client->setApprovalPrompt('force');
$client->authenticate($_GET['code']);
$token = $client->getAccessToken();
$refreshToken = $client->getRefreshToken();
$client->setAccessToken($token);
$group_entity = \Drupal::entityTypeManager()->getStorage('group')->load($_GET['state']);
$group_entity->field_google_oauth_token->value = $token['access_token'];
$group_entity->field_google_oauth_token_type->value = $token['token_type'];
$group_entity->field_google_oauth_token_created->value = $token['created'];
$group_entity->field_google_oauth_token_expire->value = $token['expires_in'];
$save_status = $group_entity->save();
return new RedirectResponse('/group/' . $_GET['state']);
}
}
public function revoke($group = NULL){
$client = new Google_Client();
$group_entity = \Drupal::entityTypeManager()->getStorage('group')->load($group);
$result = $client->revokeToken($group_entity->field_google_oauth_token->value);
$group_entity->field_google_oauth_token->value = '';
$group_entity->field_google_oauth_token_type->value = '';
$group_entity->field_google_oauth_token_created->value = '';
$group_entity->field_google_oauth_token_expire->value = '';
$group_entity->save();
return new RedirectResponse('/group/' . $group);
}
}

Answer 1

If you have already requested an access token for that login / dev. token combo, it won't return it again for you. You'll have to revoke access by going to https://myaccount.google.com/permissions. Find your app, revoke access, and try again.
Source: I had this exact same problem and after nearly pulling my hair out, I figured this out.