We are also running into this issue. We've had TestFlight testers report seeing “There is no information available for In-App Purchases. Try again later. 21105” as of August 29th. It seems to be exclusively happening to users that have never purchased a subscription through our app previously. Users that had previously purchased a test subscription over a week ago have not run into any issues.
We've had our submission rejected because of this and have submitted a support ticket that has not yet been productive.
FiveTalent
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As of today, I am no longer seeing this issue. Has this been resolved for others as well?