Hi @Maria_Saiz
I have a Sterzo Smart. The steering works just fine with a different brand of trainer. I personally have a Saris Hammer S3.
These are the instructions for using the Sterzo Smart with Zwift.
Depending on when your Sterzo was manufactured - you may have to update the Sterzo to the current firmware version before you use it with Zwift. Here is info from June 2021 when Elite made a change to that process. One of the important steps is that you must create a (free) user account on Elite’s support site to register yourself.