Send notification to requester when a worklog is saved

Send notification to requester when a worklog is saved

We would like to send the requester a email notification when a worklog is created on a ticket so that they know their request is being worked on.
We have turned on  Acknowledge requester by e-mail when the request is updated and  Notify requester when a request is updated by editor

but neither of these appear to create an email for any actions that I've performed.

Any experiences anybody can share?

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