Hi @envisiondesign,
Thank you for asking before changing anything. GTM4WP is not affected by this and nothing about the plugin needs to change because of it.
The notice is one piece of a larger change, where Google tags and Tag Manager containers are being merged into one thing. A container will send data to Google destinations directly, instead of loading a separate gtag.js file for them the way it does today. The part your customer was written to about is that a gtm.js snippet will initialize when the container loads and will no longer wait for a gtag('config') command sitting on the page. For anyone who needs the old waiting behavior, Google’s own recommendation is the gtm init trigger inside the container rather than a move to the gtag/js snippet.
None of that involves the plugin. GTM4WP only ever writes a container snippet, because every place it accepts or outputs a container ID requires the GTM-XXXXXX form and rejects anything else, and the only gtag command it writes anywhere is a consent default rather than a config command.
Simo Ahava has written up the whole announcement and it is worth reading if you want the full picture:
https://www.linkedin.com/posts/simoahava_big-changes-coming-to-google-tag-manager-activity-7457415125600407553-xHZk/
Two points from it are worth having in front of you now. None of this happens to a container on its own, so there is nothing your customer has to do this week, and the merge does not mean that Tag Manager begins sending data to Google Ads or Analytics by itself.
What is still worth checking is which of the two setups the mail actually found, and the page source answers it. Open any page and look at the ID in the googletagmanager.com/gtm.js?id= URL. If it reads GTM- then that is the plugin’s container, a Google Ads tag configured inside it is the ordinary way to run Ads through Tag Manager, and there is nothing for you to do. If it reads AW- then that snippet came from something other than GTM4WP, and that is the one Google is asking about.
Please let me know what you find and I am happy to help from there.
