Hi Javier,
You can do the following:
1) Create a new data source and give it the same name as the cookie. Make sure the name matches exactly (i.e. if the cookie is called "testCookie", then the data source must also be called "testCookie").
2) Set the Data Source type to "Cookie Value"
3) In your load rule, select the new data source as the basis for your condition.
Hope this helps.
Craig.
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documentation https://community.tealiumiq.com/t5/Swift/tkb-p/swift.