Hey NolanTEPM,
If I understand correctly, you are trying to redeem a code for a movie in iTunes and it is asking for the disk, but not recognizing the disk.
If your digital copy doesn't include a code, search the Internet for the service you can use to redeem it. In the United States, you can redeem some digital copies in the Movies Anywhere app and transfer them to your Apple ID so you can use them in the Apple TV app or iTunes for Windows.

If your Digital Copy DVD, or Blu-ray, or 4K title is damaged, scratched, or missing its redemption code or Digital Copy disc, contact the appropriate studio for help:

If you have trouble redeeming your Digital Copy code or downloading your Digital Copy, contact Apple Support. You can also check whether your redemption code materials include an expiration date."
Redeem digital copies of DVDs or Blu-rays in the Apple TV app or iTunes for Windows
Please don't hesitate to let us know if the steps resolved your issue or if you need additional assistance.
Thank you for using Apple Support Communities. Have a good one.