An Event Grid trigger on an Azure Function is not firing, though the subscription reports successful deliveries. Where should you look first?

1. ✓ A The function's own logs and any exceptions inside the handler (correct answer)
2. B The storage account firewall
3. C The Event Grid schema version
4. D The subscription filter

Shortcut: A successful delivery means Event Grid received a 2xx. If downstream work is not happening, the fault lies inside the function, so its invocation logs and exceptions are the place to start.