51303441: problem with subscription offer( discount offer) payment

[openradar-mirror]

Description

Area:
StoreKit

Summary:
We currently have subscriptions integrated, and it works without any issues.
We are integrating new discount subscription (https://developer.apple.com/documentation/storekit/in-app_purchase/implementing_subscription_offers_in_your_app?language=objc) and we have encountered the following error.
While trying to purchase subscription (in sandbox environment) with a discounted offer , we get success screen on the device but while debugging we get an error:
'Error Domain=SKErrorDomain Code=0 “Cannot connect to iTunes Store” UserInfo={NSLocalizedDescription=Cannot connect to iTunes Store}'.
While checking with the store api(https://sandbox.itunes.apple.com/verifyReceipt) we confirmed that the purchase was indeed successful ( new renewal with "promotional_offer_id" was present in the receipt).

Expected Results:
This should not throw an error when the purchase is successful.

Product Version: 12.2, 12.3.1
Created: 2019-06-03T08:47:47.788795
Originated: 2019-05-31T00:00:00
Open Radar Link: http://www.openradar.me/51303441