Question: I am currently using FireBase CloudMessaging(FCM) for ios notification, I just want to confirm if this update is something third party provider has to update (eg. update the certificate on their side) since my backend server does not send directly to the APNs? Or if this is something I need to change, FCM hasn't updated anything on their website regarding to whether they will be impacted by this issue.

Upgrading to IOS 14 fixed it for now, but it still persists on IOS 13.7, any news from apple side...??? I am surprised how this has been an issue around for so long

Good to know it is not just myself. Currently doing sandbox testing for validating the receipt on IOS 13.7 Xcode 12.0, I originally had this issue about a week ago and was able to fix it with nelic advice. https://developer.apple.com/forums/thread/90594 However, today once I updated my changes, it starts to return Cannot connect to Itunes store, response code 0. So I revert back to the working version and it started to fail again, so frustrating. What I NOTICED is that when I start the purchase, there is no more Use Existing Account. option!!! TroubleShooting: Difference phone device Reboot device Pod install New Sandbox User Just want to clarify if this is a local issue, or server side issue.