Event Streaming not functioning after proper setting at Event Producer site and Event Consumer site

Just for learning Event Streaming, I could not see it working. I have used settings for the same user as System Manager at both sites and could configure well and approve the docs.

The event is not streaming even after proper settings at the Event Producer and Event Consumer sites. Only when observing the Background Jobs I can find something related to the issue where it shows frappe.exceptions.DoesNotExistError with Event Producer address in HTTP (can refer to image).

No record was found in the Event Sync Log at the consumer site though at the Producer site records are available in the Event update Log.

Any pointer to find out the issue?