Make sure you have the piece of code for your IQ profile on every page on your site. The code you get from Code Center in IQ (menu top right corner). Make sure the exact URL in the code to utag.js matches the environment (dev, qa, prod).
If you want to use data from the rest of the website, create a corresponding variable in the datalayer with exactly the same name.
Other variables used only within TealiumIQ tags or scripts, e g to pass data to a pixel, can have any name following a name convention of your choice.
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