We’re testing SKAN postbacks via AdAttributionKit but aren’t receiving any requests on our server even after generating development impressions and triggering a postback. Setup: Domain: https://linkrunner-skan.com Configured in Info.plist as: <key>NSAdvertisingAttributionReportEndpoint</key> <string>https://linkrunner-skan.com</string> <key>AttributionCopyEndpoint</key> <string>https://linkrunner-skan.com</string> Apple automatically appends the .well-known paths: /.well-known/private-click-measurement/report-attribution/ /.well-known/skadnetwork/report-attribution/ ATS diagnostics for the domain: PASS for all tests (TLS 1.0–1.3, PFS disabled, arbitrary loads allowed, etc.) Both .well-known paths are publicly accessible and return 200 OK Testing Flow: Enabled Developer → AdAttributionKit Developer Mode on iOS (15+) Followed Apple’s official guide: Testing AdAttributionKit with Developer Mode Generated test impression using: createAdAttributionKitDevelopmentImpression implemented in SKANManager.swift Called Postback.updateConversionValue with lockPostback: true Created Development Postback from Developer Settings Waited 30+ minutes while intercepting server requests (proxy + backend logs) What We’ve Tried So Far: Confirmed ATS compliance with nscurl --ats-diagnostics (all PASS) Verified .well-known paths are accessible publicly without redirects Tested endpoints manually with a POST request – server responds 200 OK Confirmed Info.plist entries exactly match Apple’s required keys Double-checked iOS device is running iOS 15+ with Developer Mode enabled Repeated test flow multiple times with fresh impressions and postbacks Waited up to 1 hour for postback (in case of delays) Issue: No POST requests are being received from Apple to either .well-known endpoint, even though the setup appears correct and ATS tests pass. References Used: Configuring an Advertised App Generating JWS Impressions Question: Has anyone faced a similar issue where AdAttributionKit Development Postbacks are not firing despite correct Info.plist setup, ATS compliance, and reachable .well-known endpoints? Any insight into possible missing configuration steps or testing nuances would be greatly appreciated.