StoreKit 2 - Promotional Offers - .invalidOfferSignature error. Can't purchase any offer.

[roboqo]

• [x ] I have updated Purchases SDK to the latest version
• [x ] I have read the Contribution Guidelines
• [ x] I have searched the Community
• [ x] I have read docs.revenuecat.com
• [ x] I have searched for existing Github issues

Describe the bug
Our RevenueCat SDK is configured like this and usesStoreKit2IfAvailable is set to false

Purchases.configure(
    with: Configuration.Builder(withAPIKey: "MY_KEY")
        .with(usesStoreKit2IfAvailable: false)
        .build()
)

Then we did implemented Promotional Offers feature following steps described in RC: iOS Subscription Offers

Basically:

let product = somePackage.storeProduct
guard let discount = product.discounts.first else {
    throw PurchaseError.promotionalOfferNotFound
}

let promotionalOffer = try await Purchases.shared.promotionalOffer(forProductDiscount: discount, product: product)

// All good here, presenting offer UI

// Purchasing using code below:

Purchases.shared.purchase(
    product: product,
    promotionalOffer: promotionalOffer,
    completion: responseHandler
)

All worked fine, we have this in production app and all is good there. But, we want to move to StoreKit 2 and by just changing our SDK configuration code to:

Purchases.configure(
    with: Configuration.Builder(withAPIKey: "MY_KEY")
        .with(usesStoreKit2IfAvailable: true)
        .build()
)

That is setting usesStoreKit2IfAvailable to true - we can't purchase ANY promotional offer, always getting the same error:

[Purchases] - ERROR: 😿‼️ The information associated with this PromotionalOffer is not valid. See https://rev.cat/ios-subscription-offers for more info.
[Purchases] - ERROR: 💰 Product purchase for 'PRODUCT_IDENTIFIER_HERE' failed with error: PurchasesError(error: The information associated with this PromotionalOffer is not valid.
See https://rev.cat/ios-subscription-offers for more info., userInfo: ["readable_error_code": "INVALID_PROMOTIONAL_OFFER_ERROR", "source_function": "invalidPromotionalOfferError(error:fileName:functionName:line:)", "NSUnderlyingError": StoreKit.Product.PurchaseError.invalidOfferSignature, "source_file": "RevenueCat/ErrorUtils.swift:413", "NSLocalizedDescription": "The information associated with this PromotionalOffer is not valid.\nSee https://rev.cat/ios-subscription-offers for more info."])

1. Environment
   1. Platform: iOS
   2. SDK version: 4.15.0
   3. StoreKit 2 (disabled with useStoreKit2IfEnabled(false)) (Y/N): Y
   4. OS version: 16.1.1
   5. Xcode version: 14.1
   6. How widespread is the issue. Percentage of devices affected.
2. The same problem is with older SDK version - Promotional Offers works fine with SK1, but we always get the same error after enabling SK2

[RCGitBot]

👀 SDKONCALL-182 We've just linked this issue to our internal tracker and notified the team. Thank you for reporting, we're checking this out!

[NachoSoto]

Thanks for the report!
Good news: we've identified the issue and a fix will come out shortly (see #2020)

[NachoSoto]

The fix for this is out on the latest release 🎉

[github-actions]

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