Hello
I am trying to automate a comment, and I need to use a previous value of a field within the ticket
To explain, we use a project in Jira as an Asset Register. A device/thing is assigned to a person using a 'Assigned To' user-picker custom field. All this assigning thing works fine.

When unassigning to the person, by removing the value of the Assigned To field, I want a comment to be automatically made on the ticket saying "Device Unassigned from "Previous Value of Assigned To" but I can't get it to pick up the name

I've tried using {{changelog.<field>.from}} and the {{issue.linkedIssues.<linkType>.<field>}} to try and pull it from the linked issue, but the name still isn't populating, even though the automation runs as success
Any ideas?
Thanks!