Target field in mails in inbound email action is empty and incident is not getting created.

I have configured the system to create an incident whenever an email is sent to our ServiceNow instance. Specifically, I sent an email from my Gmail account to dev****@servicenowdeveloper.com with the subject line "Create Incident" and the body containing "TEST12."

However, I noticed that in the System Logs under Mail, the Target Field (Instance) is showing as empty, and no incident is being created as expected.

Could you please provide guidance on how to resolve this issue? Any insights or suggestions would be greatly appreciated. I am attaching the screenshot of it.

Thank you in advance for your assistance.