Very confusing documentation, its says
Request a Workfront test drive
To complete the exercises in the Workfront Fusion learning paths, you will need a Workfront test drive. If you already have a test drive, we recommend a new one for this training.
Request a practice environment by filling out this form. If you’re unable to access the form, send your name, email address, and company name to wfttstdr@adobe.com.
Which seems to clearly say you can get a test enviroment... then it says.
Access Workfront Fusion for practice
Workfront does not offer Workfront Fusion test drives. To practice as you complete the tutorials, request access to Workfront Fusion from your organization’s Workfront Fusion administrator.