Hi Massimiliano,
You need to login to CCT Admin console using your primary email address and then click on “Add License” to add the Adobe Stock seat. Once added, you will have to assign that seat to anybody you wants to.
Once Adobe Stock seat is assigned, you will be able to download images from https://stock.adobe.com. You will also have to place an order through your Reseller against that seat.
Please do let us know if you still face any issues.
Thanks,
Ratandeep Arora