Your paper is saved to Turnitin's global database. If you use a public key for a "practice" check and it's a repository account, your final submission to your actual school will show a 100% similarity score because Turnitin will match it against your own previous "anonymous" submission.
To help find the best solution for your current writing project, let me know: Does your university use ?
A case-sensitive password chosen by the instructor that students must enter to join that specific class. Koç Üniversitesi Why These Are on GitHub turnitin class id and enrollment key github
Ask your university library or writing center if they have a "Turnitin Self-Check" portal. Many universities have a specific "class" on their Learning Management System (Canvas/Blackboard/Moodle) where students can submit drafts to check for similarity before the final submission.
Using a public ID to "test" your work can be flagged as academic dishonesty, as these IDs are intended only for students officially enrolled in that specific course. Permanent Storage (Repository Settings): Your paper is saved to Turnitin's global database
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The Myth of Turnitin Class IDs and Enrollment Keys on GitHub: What You Need to Know A case-sensitive password chosen by the instructor that
"I actually got it to work. Checked my paper. Saw a 8% similarity. Felt great. Then submitted to my real class. Turnitin flagged 92% because my earlier test submission had been added to their database. I failed the class." –