403 Error when checking server request

After following the directions step-by-step my subdomain received this error so I tried using the default Tagging Server URL and still got the same issue. Not sure how else I can debug this.

Hi, did you use id of GTM Web container here?
Look like this is id of Server side GTM container.

Your container is not accessible from google servers https://www.googletagmanager.com/gtm.js?id=GTM-PB78KZC

There are two reasons for that:

  1. This is Server container GTM id
  2. You did not publish the init version of the web container
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I realized that I did not indeed publish the container. Does it take a while to register into the system?

I am using a server container GTM as I’m following the directions of this tutorial:

Does it take a while to register into the system?

Yes. But it’s up to five minutes.