Certain users are not able to access Premium features

My app is having an issue with only some users not being able to access Premium features.  Apple will indicate that the payment/subscription was successful, but not allow these users to access to the Premium features.  And if those users try to purchase/subscribe again, a popup will indicate that he/she is already subscribed to this. But again, they can't access the premium features. We can't replicate this internally because it only seems to be an issue with a few users. We can't quite figure out what the issue is and why it's only occurring for some users.

Has anyone experienced this?

We are having the same issue, anyone else experienced this and found a fix?

Thanks Laura

Certain users are not able to access Premium features
 
 
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