Trying to add an automation so that, when an issue is transitioned into QA, the "Assignee" then becomes the "Developer" (a custom field). The automation is not working.
So far, I have the following automation:

The possible issue could be that because Developer is a custom field, it is more than likely trying to find the built in field of "Developer" like we have on other projects.
Do I need to fill out something in this field to get it to work?
