Server to server notification are not send

Hello, I have implemented a server to server notification, it was working until last Friday, but suddenly it stopped to work.
Is there any way to track why it stopped working and how we can re-enable it?
Our notifications have not been working for any production subscriptions, but they are working for sandbox ones. Do they work for you when making sandbox subscriptions or purchases?
How do you implemented this in the backend server ?

I'm facing the same issue, have you made any progress with it? In my case, the problem start time is about 2024/10/10 16:00(UTC+8)

Server to server notification are not send
 
 
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