I'm working in Apple's Sandbox environment to implement in-app purchase of an auto-renewable subscription.
I followed the instructions at this link in order to Enable Billing Grace Period: https://developer.apple.com/help/app-store-connect/manage-subscriptions/enable-billing-grace-period-for-auto-renewable-subscriptions.
However, when I receive an App Store Server Notification for when the user's billing method fails (DID_FAIL_TO_RENEW), it includes no information about the gracePeriodExpiresDate and we never get a GRACE_PERIOD_EXPIRED notification.
Logs showing App Store Server Notification not reflecting Grace Period Enabled.
I enabled grace period in App Store Connect like three weeks ago, so it's not a delay there.
What can I do to test out Billing Grace Period? Is this just an Apple bug?