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There are several possibilities:

1. Your Available From date is after the Feedback Release Date is set before the Start/Opening Date.
   

   You receive an error similar to:
   Sorry, we could not process your request.

   Turnitin assignment could not be created.
   date_post - post date must be after start date
   
   You can rectify this by editing the Folder Open Date in IVLE Available from date in Canvas to an earlier date (not more than one year before the current date). As the Feedback Release Date cannot be displayed when you encounter this error, you will have to set the Available from date to a much earlier date, save it and see if the Turnitin Assignment is displayed correctly.
   
   
2. Check the Accessible To Assign to setting in the folder's settings in Files.
   Check the options as necessaryCanvas assignment settings.
   
   
3. If you are using PeerMark, your Feedback Release Date for the PeerMark assignment is before the Feedback Release Release Date of the assignment folder.
   
   You can rectify this by editing the Feedback Release Date of the assignment to just after normal submission closes.

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If none of these are the cause of the students' access issues, please refer them to the I cannot upload to Turnitin FAQ.