Hello everyone, I’m hoping someone might help with auto-renewable subscription validation in Apple’s Sandbox environment. Here’s the situation: My Setup: I’ve configured three auto-renewable subscriptions in App Store Connect and generated an In-App Purchase key (with the correct Issuer ID and Key ID). (I also tried the App Store Connect API Keys) I’m using Apple’s App Store Server API v2 endpoints (GET /inApps/v2/subscriptions/{originalTransactionId}/latest) to fetch the latest subscription status. I’ve created several Sandbox test users (with fresh email addresses), signed out of old test accounts on my devices, and tested purchasing subscriptions anew. What Works: I am receiving valid Server Notifications from Apple (e.g. SUBSCRIBED, DID_RENEW) with the correct environment: "Sandbox" field. My JWT generation appears to be correct because I’m no longer receiving 401 errors—only 404. That suggests Apple accepts the key and credentials. My fallback logic attempts production first; if it sees a 404 or 410, it switches over to the Sandbox endpoint. This is exactly what Apple’s documentation recommends. The Problem: Whenever I query GET https://api.storekit-sandbox.itunes.apple.com/inApps/v2/subscriptions/{originalTransactionId}/latest using the originalTransactionId from Apple’s own Server Notification, Apple returns a 404 (indicating it can’t find that subscription). This happens even though the subscription is active in Sandbox (I see notifications arriving for it). I’ve tried adding a brief waiting period (2 seconds) before calling the Sandbox endpoint, but it consistently returns 404. I’ve also tried multiple retries over a longer timeframe without success. I tested multiple fresh Sandbox test users, ensuring each one was signed in to the device’s App Store. After each new purchase, I still get the same 404. Additional Checks: These are definitely auto-renewable subscriptions, not non-renewing or consumable products. I also tried calling GET /inApps/v2/subscriptions/{transactionId}/latest but I still see 404. I tried everything mentioned above in production as I said to no avail: GET https://api.storekit.itunes.apple.com/inApps/v2/subscriptions/{originalTransactionId}/latest