Another data point: a new spike of "Unable to Complete Request" starting around 2026-09-28, still ongoing. Filed Feedback ticket as FB25329618 Mostly US users but across other countries too. App Apple ID 804982722, paid non-consumables, mostly iPad. StoreKit 2: Product.purchase throws StoreKitError.unknown with empty underlyingErrors, ~1 s after the user authenticates and the payment sheet dismisses. Rate went from 0.5–1% to ~4% of attempts on Sep 29 StoreKit 1 on an old build we haven't changed (iOS 12.5.x iPads): SKErrorUnknown failures up ~5× from the week of Sep 28. Completed purchases on that build are down ~40% with flat usage. One user who recovered on retry under iPadOS 26.6.2 now fails every time on 27.0.1. This looks related to https://developer.apple.com/forums/thread/851195 (FB25186860, 26.7.1 / 27.0.1).

We're seeing what looks like the same regression, also starting around 2026-09-28, but for paid non-consumables: StoreKit 2: Product.purchase throws StoreKitError.unknown ("Unable to Complete Request"), underlyingErrors empty. It happens after the App Store sheet is shown and the user authenticates; the error arrives within ~1 s of the sheet dismissing. Rate went from 0.5–1% to ~4% of attempts over Sep 29–Oct 2. Mostly iPad, all iOS versions. StoreKit 1 on an old build we haven't changed (iOS 12.5.x iPads only, so not affected by 26.7.1/27.0.1): SKErrorUnknown failures went up ~5× from the week of Sep 28, still ongoing. This is why we think it's Apple server-side. One user's failures cleared on retry on iPadOS 26.6.2 but now fail every time since updating to 27.0.1. Filed as FB25329618 with breadcrumb timelines. Is there any update on FB25186860, or anything apps should do differently when this error comes back after authentication?