In the Turnitin integration with Moodle, the “Copy Assignment ID” feature is intended to copy the Submission OID to the clipboard. However, due to missing permissions in the LTI iframe configuration, this functionality fails to work and nothing is copied to the clipboard. By explicitly allowing clipboard access (for example, using allow="clipboard-write; clipboard-read" in the iframe), the Submission OID should properly copy to the user’s clipboard as intended.

Edit [Jake]: This is a problem in Chrome, but I didn't see this in Firefox (didn't test others).