Good morning Xavier,
I am assuming that you are referring about access to Qlik Sense Cloud Business? In order to "link the license with the user" the owner of the Qlik Sense Cloud Business workgroup must have an available/unused seat, and invite the user to join the workgroup by using the email address associated with their exiting cloud account.
Here are some more detailed resources:
I will reach out to you via email and connect you with your regional Cloud Success team member to ensure you're able to access your licenses. You can reach us at firstname.lastname@example.org anytime.
Thanks for your question - please take a look at this video which shows you how to set up the authorization for the seats of users you may have purchased.
It walks you through the invite and admin process as well as a few other things you may find interesting.
Main videos here:
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