DID_FAIL_TO_RENEW

When does Apple plan to support a server notification for when a subscription auto renews? Best I can tell from the documentation and online articles there doesn't appear to be a notification type for this scenario. There are notifications when a renewal fails because of billing issues (ie DID_FAIL_TO_RENEW), when a previously expired subscription gets renewed (ie DID_RECOVER), and when a user interactively triggers a renewal (ie INTERACTIVE_RENEWAL). But nothing for when a user transitions from say a trial to an automatic renewal. Seems like a pretty big gap for a subscription-based notification system.

I tried multi sandbox account and read this post: https://forums.developer.apple.com/thread/130456We have the same problem for some accounts: DID_FAIL_TO_RENEW and the expiration_intent = 4 (The product was not available for purchase at the time of renewal.)While if we tried a new account or simply buy the goods manually, it works and gives us a new transaction id.Because of the experience, I can't test the auto subscription. I read the document and it said the transaction id is unique for buying and renewal, but I never see new transaction-id except manually buy.Is it a regular performance?

Our Server always receive about DID_FAIL_TO_RENEW when first subscription