Hello,
I am looking for help using Automation for JIRA to copy the author from the last ticket comment into a custom (user Picker) field, when a ticket is commented on.
As shown below in the screenshot. (In this instance, I manually edited the field)
The reason is, I would like to be able to setup a JQL filter, to filter the last comment author against the tickets assignee.

I have setup the custom field 'Last Commented User' customFieldId=10603
and the Automation for JIRA rule looks like this.

The rule failed error messages look like this.

Can anyone provide any advice?
Thanks ...
F.Y.I, we are running the below (server) versions ...
JIRA Service Desk 3.16.0
Jira Software 7.13.0
Jira Core 7.13.0
Automation for Jira 7.2.3