When creating the Google Tag Manager container at:
Then you should create separate containers for the standard WordPress site and the the AMP version.
When creating the AMP container then you must choose container type= “AMP”
When creating the container for use with the NON-AMP then you should create a container type= “Web”
This means there will be different “container” / “container type” and different tags for the AMP and the non-AMP version of the site.
The settings for the GTM can be found in Dashboard > AMP > Analytics > then select GTM from the dropdown.
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