-
It seems like there might be an issue with the timing or the scope of variables in Google Tag Manager. Variables in GTM have different scopes and lifetimes depending on how they are used. For instance, if these variables are defined in a specific event and you are trying to retrieve them after the event has fired, they might not be available. Hence, the “undefined” or “null” values. This might explain why manually entering a string instead of the dataLayer variable for the “value” seems to work, as the string is available immediately.
To debug this issue, you should verify if the variables are correctly populated by means the GTM preview mode. This allows you to see how your tags, triggers and variables load and behave in real time on your site. You should also verify whether the variables are still present in the dataLayer at the time the UET tag fires. If the variables have been lost, you might need to revisit how you’re managing your dataLayer. Moreover, ensure that the UET tag fires after the dataLayer has been populated with the required variables.
Last but not least, always confirm your settings after making changes and conduct tests to ensure everything has been set up properly. The goal is to make sure your GTM setup fires and sends data as expected.
