Have you looked in the network requests tab in developer tools to see which tags are firing? You should be able to see the ID there. It will be the tid parameter if you filter for www.google-analytics.com/collect? requests
Have you looked in the network requests tab in developer tools to see which tags are firing? You should be able to see the ID there. It will be the tid parameter if you filter for www.google-analytics.com/collect? requests