"Error handling payment sheet request" with Backyard Bird sample application

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After downloading Backyard Birds and following the steps in the section "Configure the sample code project" (i.e. enabling local StoreKit testing in the scheme).

When I run the macOS app from within XCode, the following error occurs.

Whenever I try to purchase any item from within the app, I am presented with the following error dialogue:

"Couldn’t communicate with a helper application. Try your operation again. If that fails, quit and relaunch the application and try again."

This happens after I click the purchase button (i.e. the button that displays the price).

The Xcode logs show the following errors:

Error handling payment sheet request: Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service created from an endpoint was invalidated from this process." UserInfo={NSDebugDescription=The connection to service created from an endpoint was invalidated from this process.}
Type: Error | Timestamp: 2025-09-26 18:05:36.214491+02:00 | Process: Backyard Birds | Library: StoreKit | Subsystem: com.apple.storekit | Category: Default | TID: 0xafed

followed by

Purchase did not return a transaction: Error Domain=ASDErrorDomain Code=5115 "Received failure in response from Xcode" UserInfo={NSDebugDescription=Received failure in response from Xcode, NSUnderlyingError=0x600001545470 {Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service created from an endpoint was invalidated from this process." UserInfo={AMSDescription=Ein unbekannter Fehler ist aufgetreten. Versuche es erneut., AMSURL=http://localhost:49244/WebObjects/MZBuy.woa/wa/inAppBuy, NSDebugDescription=The connection to service created from an endpoint was invalidated from this process., AMSStatusCode=200, AMSServerPayload={
    "app-list" =     (
    );
    dialog =     {
        cancelButtonString = Cancel;
        defaultButton = Buy;
        explanation = "Do you want to buy one Box of Nutrition Pellets for $3.99?\n\n[Environment: Xcode]";
        initialCheckboxValue = 1;
        "m-allowed" = 0;
        message = "Confirm Your In-App Purchase";
        okButtonAction =         {
            buyParams = "bid=com.example.apple-samplecode.Backyard-BirdsHQN4U5V5MY&bvrs=1.0&offerName=pellet.box&quantity=1&deviceVerification=0aee9116-fef7-5d20-b21b-b28848615717&storekitViewInitiated=true";
            itemName = "pellet.box";
            kind = Buy;
        };
        okButtonString = Buy;
        paymentSheetInfo =         {
            caseControl = true;
            confirmationTitle = Pay;
            countryCode = US;
            currency = USD;
            designVersion = 2;
            displayPrice = "$3.99";
            flexList =             (
                                {
                    value =                     (
                                                {
                            style = priceMain;
                            value = "$3.99";
                        },
                                                {
                            style = priceSub;
                            value = "One-time charge";
                        }
                    );
                },
                                {
                    header = "$null";
                    value = "For testing purposes only. You will not be charged for confirming this purchase.";
                }
            );
            price = "3.99";
            requestor = AppStore;
            salableIcon = "http://localhost:49244/StoreKit/AppIcon?bid=com.example.apple-samplecode.Backyard-BirdsHQN4U5V5MY";
            salableIconType = app;
            salableInfo =             (
                "Box of Nutrition Pellets %%image_0%%",
                "Backyard Birds",
                "In-App Purchase"
            );
            styles =             (
                                {
                    bold = true;
                    name = priceMain;
                    size = large;
                },
                                {
                    color = gray;
                    name = priceSub;
                },
                                {
                    bold = true;
                    name = priceMainSpaceBefore;
                    size = large;
                    spacingBefore = medium;
                }
            );
            title =             {
                type = text;
                value = Xcode;
            };
        };
    };
    "download-queue-item-count" = 0;
    dsid = 17322632127;
    failureType = 5115;
    jingleAction = inAppBuy;
    jingleDocType = inAppSuccess;
    pings =     (
    );
}}}}
Type: Error | Timestamp: 2025-09-26 18:05:36.346918+02:00 | Process: Backyard Birds | Library: StoreKit | Subsystem: com.apple.storekit | Category: Default | TID: 0xafea

I am running

Xcode Version 26.0.1 (17A400)
macOS Sequia 15.7

What I have tried so far:

created a new admin user, logged in as that user, installed Xcode and ran the Backyard Bird sample from there. Same error.

This also happens with my own app, when I am trying to test purchasing.

How can I further debug this problem?

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