How to enable Purchase Order creation failure notifications In Cloud when PO is created via API?

Summary:

We are creating PO via API. Requirement is to receive an email when PO creation fails.

However whenever its successful, no email should be sent.

Content (please ensure you mask any confidential information):

In BPM worklist, for DocumentOpenFY taskI, I have removed the Assigned and assignee tab so that no successful emails are received. I have kept task status as Error for various receipients like Owner/ Assignee but still not getting emails.

We have just created only 1 auto approve rule for Purchase orders

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Code Snippet (add any code snippets that support your topic, if applicable):