I have same issue in my case:
XCode 12.3
iOS 14.3 (IP 7)
Message:
"There is no information available for In-App Purchases. Try again later.
21102
Environment: Sandbox"
Brand new sandbox user without any purchases (as I don't have one with any already existing).
mtajchert
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I can confirm adding "+" no longer works which is very frustrating.