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Hello, To achieve this, you can create a new JavaScript Code extension in Tealium iQ Tag Management to read the LILO cookie value and set it as the user_hashedID in your data layer. Here's how you can do it: In Tealium iQ, navigate to the "Extensions" tab and click on the "Add Extension" button. Select the "JavaScript Code" extension. In the configuration panel, set the scope to "Pre Loader" to ensure that the cookie value is read before the tags are loaded. Add the following JavaScript code to read the LILO cookie value and set it as the user_hashedID in the data layer: function getCookie(name) { var value = "; " + document.cookie; var parts = value.split("; " + name + "="); if (parts.length == 2) return parts.pop().split(";").shift(); } var liloCookieValue = getCookie("LILO"); if (liloCookieValue) { utag_data["user_hashedID"] = liloCookieValue; } Replace "LILO" in the getCookie function call with the actual name of the LILO cookie if it's different. Save and publish your changes. This extension will read the LILO cookie value and set it as the user_hashedID in the data layer when the user_hashedID is empty. Since you mentioned that the mapping is already done in the global page load rule, the prop27 variable should now receive the LILO cookie value. I hope this helps! Let me know if you have any questions or need further assistance. ... View more