New/Returning condition type

Hello

I need to target surveys on site (via Medallia Digital Platform) based on user types (new/returning).

As my data layer doesn't store (yet) new/returning visitor types parameters i thought about using Launch as a way around.

I created a rule with the following specifics for returning visitors:

Event: DOM Ready

Conditions: condition type New/Returning visitor (returning visitor option selected)

Action: custom code - javascript (execute globally)

var isMedalliaReturningVisitor = true; 

The plan was to use this variable as a hooker for Medallia to trigger the survey. This doesn't seem to be working - any idea why?

Thank you for your support!

Gabbi