This post is from the WWDC26 StoreKit, In-App Purchase, and App Store Server API Q&A.
SKTestSession configurations seem to have been broken starting in Xcode 26.3. The release notes for iOS 26.5 indicate that it was supposed to be fixed there, but I still haven't been able to get it to work. Is there something that has changed recently about how SKTestSession configurations need to be used?