When you are experiencing an issue redeeming a title via iTunes or unable to see it in your library immediately upon redemption you may enter the code you have received directly into either:
Lions Gate titles: https://movieredeem.com/
Paramount Pictures titles: https://paramountdigitalcopy.com/
Upon entering the code and clicking either [Enter] or [Redeem] buttons you will see your iTunes code in the [Result] section.
The code displayed contains a hyperlink. If you click this link, you will be prompted to open iTunes to redeem your code. Once the redemption goes through, you will be able to view your movie in your library.
You can also choose to redeem your iTunes code directly in the iTunes Store. Depending on your device, you may need to download the AppleTV app from the App Store to view your redeemed movie.