I assume "assign to engineer" is a status in your workflow.
The transition can be setup in the service desk automation settings.
Full explanation can be found here:
I do not think post function will work because the post function will only be activated when the workflow transition happen. You need a trigger event to make the transition. From what I understand you want to make the status transition when a comment is added.
There is a template available to auto transition when comment is added - see attached screen. (service desk server 3.8.1, should be the same on cloud)
...be more productive while being fun to use at the same time. For some, getting started can be a bit intimidating. This is especially true if Jira Service Desk is your first exposure to Atlassian...
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