Great observation Matus.
Your post prompted me to look at a few other sites that I have installed this plugin on, and also use GTM.
Google Tag Assistant works perfectly, without any errors, on these olde site.
Then, I stumbled upon this post: https://plus.google.com/u/0/+SimoAhava/posts/WVSWfxpjScj?sfc=true
Hey all, just wanted to share an additional false negative regarding Google Tag Manager and Google Tag Assistant. Many already know about the fact that Google Tag Assistant doesn’t recognize the new container snippet placement recommendation (JavaScript snippet in <head>).
Another one is that if you have a new(ish) container, where the GTM-XXXXXX id has more than 6 Xs (e.g. GTM-5PKAMGS), Google Tag Assistant will complain about invalid Account ID, as it only treats container IDs of 4-6 characters as valid. You can ignore this warning, but you might want to check the Network tab of your browser developer tools that the gtm.js library has downloaded without error.?
Maybe those of ue getting errors are using newly create GTM containers?
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This reply was modified 8 years ago by markerx. Reason: typo