title: Google tagmanger not firing on sub-domain
body: <p>I'm setting up google analytics and a FB pixel with GTM for my sub-domain. I copied the tracking code the right way in the  and the  like I always do. When I use the preview mode of GTM on the root domain everything works up to the point you open the sub-domain. Then no GTM/GA/FBP is recognised. </p>
  
  <p>The index.html page is set-up correctly and has been working for some time. In this document the code is visible in the chrome dev-tool but doesn't seem to do anything. In my cookie manager I'm able to find the relevant cookies though. Unfortunately the data isn't showing in GA or FB analytics. </p>