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first I have to say that I love the plugin. It has a lot of settings but is very easy to use - so thank you for your good work.
I use e-privacy 3.10.13
and headtag 3.5.10
I have defined two user groups: "Cookies" and "No Cookies" both from "Public". Therefore to access levels "Cookies" (Registered and Cookies and "No Cookies" (No Cookies). Both are insterted in the plugin under "Advanced". "Cookies" for Accepted Access Level and "No Cookies" for Decline Access Level.
But it seems that it doesn't work. When I define a custom tag with a Google Analytics script in your headtag plugin and set the Access Level "Cookies" it doesn't appear. It doesn't matter If I agree, disagree or do Nothing to the cookie banner. When I give the script the Access Level "public" it works.
Without logging into the backend, I'm not sure having the domain would be helpful.
What might be helpful though...
Check the order of the system plugins, and be sure eprivacy is running before headtag.
Eprivacy sets a usergroup upon acceptance of cookies, but if headtag runs first - the usergroup isn't set yet - so no ACL tags will be added for that group or access levels containing that group..... off the top of my head.