I'm using the login URL supplied by UserService.createLoginURL(...) as described in http://gae-login-explainer.appspot.com/#section_GAE_login.
The problem is that when one of my users encounters a reCaptcha, upon completion they are redirected to https://accounts.google.com/signin/lookup instead of back to my site.
The redirected link https://accounts.google.com/signin/lookup is a 404 page.
The relevant code in question is:
<?php
use google\appengine\api\users\UserService;
$url = UserService::createLoginURL($_SERVER['REQUEST_URI']);
$url is https://accounts.google.com/ServiceLogin?service=ah&passive=true&continue=https://appengine.google.com/_ah/conflogin%3Fcontinue%3Dhttps://*****.appspot.com/.
Is anyone else seeing the same thing? Is there anything I can try to change?