It would be better if you can please re-post with a screenshot with (In-app digital purchases or rentals aren't allowed on this device, but all Vudu Purchases or rentals can still be watched here), in order to understand the phenomenon better. Images / pictures speak louder than words. (Do not provide any personal credentials, such as email id, apple id, IMEI number, Serial Number, Phone number etc)
However with the limited information that you have provided, I had to guess the problems faced by you. Some of it can be understood by reading below
There are three types of in-app purchases—subscriptions, consumable purchases, and non-consumable purchases.
What is a subscription?
With a subscription, you pay to access content from an app or service for a period of time. For example, you might subscribe to Apple Music on a monthly basis. Subscriptions include services that you sign up for in an app, such as Hulu, Spotify, Pandora, or HBO NOW.
Most subscriptions renew automatically unless you cancel them. With some apps and services, you can choose how often the subscription renews. For example, you might be offered weekly, monthly, quarterly, or yearly subscriptions.
See a list of your subscriptions or cancel a subscription.
What is a non-consumable in-app purchase?
Here are examples of non-consumable in-app purchases:
- Remove ads
- Full game unlock
- Upgrade to pro edition
- Bonus game levels
You buy these items one time, and you can transfer them to other devices that are associated with your Apple ID. If you lose a non-consumable purchase, you might be able to download it again for free.
Restore your in-app purchase.
What is a consumable in-app purchase?
Here are examples of consumable in-app purchases:
- Game currency, such as coins or gems
- Extra health points in a game
- A package of exports to a new file format
You need to buy these items every time you want them, and you can't download them again for free. If you remove and reinstall an app or install an app on a new device, you might lose your consumable purchases. For example, if you install a game on your iPod touch that you started playing on your iPhone, the game levels sync, but extra health that you bought on your iPhone doesn't sync.