UnityPurchasing.Initialize cannot pass initialization after completing purchase of subscription

Sorry for the basic rudimentary question.

The code below will pass the initialization.

Code (CSharp):

1.  public void InitializePurchasing() {
2.         if (IsInitialized()) {
3.             return;
4.         }
5.  
6.         var builder = ConfigurationBuilder.Instance(StandardPurchasingModule.Instance());
7.  
8.         builder.AddProduct(WEEKLYSUB, ProductType.Subscription);
9.  
10.         MyDebug("Initialization start...");
11.  
12.         UnityPurchasing.Initialize(this, builder);
13.     }
14.  
15.  
16.     public void OnInitialized(IStoreController controller, IExtensionProvider extensions) {
17.         MyDebug("PASS");
18.  
19.         this.controller = controller;
20.         this.extensions = extensions;
21.  
22.         m_AppleExtensions = extensions.GetExtension<IAppleExtensions>();
23.         m_GoogleExtensions = extensions.GetExtension<IGooglePlayStoreExtensions>();
24.         m_GoogleExtensions?.SetDeferredPurchaseListener(OnPurchaseDeferred);
25.  
26.         //SUBSCRIPTION_MANAGER
27.         Dictionary<string, string> dict = m_AppleExtensions.GetIntroductoryPriceDictionary();
28.  
29.         foreach (UnityEngine.Purchasing.Product item in controller.products.all) {
30.             //SUBSCRIPTION_MANAGER
31.             if (item.receipt != null) {
32.                 string intro_json = (dict == null || !dict.ContainsKey(item.definition.storeSpecificId)) ? null : dict[item.definition.storeSpecificId];
33.  
34.                 if (item.definition.type == ProductType.Subscription) {
35.                     SubscriptionManager p = new SubscriptionManager(item, intro_json);
36.                     SubscriptionInfo info = p.getSubscriptionInfo();
37.                 }
38.             }
39.         }
40.     }

Then buy subscription.
Immediately after the purchase was completed, I was able to confirm the receipt with the code below.

Code (CSharp):

1.       foreach (UnityEngine.Purchasing.Product item in controller.products.all) {
2.             if (item.receipt != null) {
3.                 MyDebug("Product receipt found = " + item.definition.id.ToString());
4.             } else {
5.                 MyDebug("item.receipt == null");
6.             }
7.         }

I was able to confirm the receipt in.

However, when I restarted the app while continuing the purchased subscription, the initialization could not pass.

Where is the problem?

If you cancel your subscription, it will pass the initialization.

I want to check the receipt after restarting the app.
However, if you do not pass the initialization, you will not be able to confirm the receipt.
Can the receipt be confirmed without passing the initialization?

If you have purchased a subscription, you cannot purchase the subscription, so initialization will not pass. I think that's what it means.

 

I want to get a receipt for a purchased subscription.
If I know the product ID, can I get the purchased receipt without initializing it?
I can't find the code in this case anywhere.