productNotAvailableForPurchaseError (error code 5): Product not available for purchase

• StoreKit 1: SKError.storeProductNotAvailable, the requested product is not available in the store.
• StoreKit 2: StoreKitError.notAvailableInStorefront and Product.PurchaseError.productUnavailable (source).
• Android: Play Billing ITEM_UNAVAILABLE. Google describes it as a product that is not available for purchase for this user and says to refresh product details and check the product's configuration (Google docs).
• Android Test Store: the product has no purchase option or no base price. The SDK raises this error with "Base price is required for test subscription products".
• Amazon Appstore: Amazon answered INVALID_SKU for the purchase request.

• Do not retry the same call. The product stays unavailable until you or the store fix it.
• Hide the package or show "not available in your region" so the customer is not stuck on a dead button.
• Do not grant access. Report the product ID to your own logging so you notice a broken product before customers do.

// Swift
do {
  let result = try await Purchases.shared.purchase(package: package)
} catch let error as ErrorCode where error == .productNotAvailableForPurchaseError {
  // handle product not available for purchase
}

// Kotlin
if (error.code == PurchasesErrorCode.ProductNotAvailableForPurchaseError) { /* ... */ }

On RevenueDot: Your offering's packages point at products by their store identifier, and the SDK asks the store for exactly that ID. If a product's store_identifier in RevenueDot does not equal the store's ID, the store answers with no product. See why an entitlement is not active.