title: Browser blocks cross domain iframe cookies
body: <p>I have a forum-like component which I use in an iframe on other websites. This component uses django-allauth for authentication with Facebook and Twitter. Everything worked fine but now the authentication stopped working some time ago. When I look at the cookies in my browser, the cookies from Facebook/Twitter which are set by the iframe, are not loaded. Although, the cookies from the component itself are set.
  The authentication still works when I load the iframe on a website which is on another subdomain of the component itself.</p>
  <p>Tool on another subdomain (working):
  <a href="https://shop-sandbox.adbuddy.be/discussie/" rel="nofollow noreferrer">https://shop-sandbox.adbuddy.be/discussie/</a></p>
  <p>Tool on a totally different domain (not working):
  <a href="https://mama-calinka.webbuddy.be/discussie/" rel="nofollow noreferrer">https://mama-calinka.webbuddy.be/discussie/</a></p>
  <p>I guess this problem had something to do with CORS-headers but nothing I've tried helped. Can someone help me with this problem please?</p>