I've seen a lot of posts on this but unable to solve the problem.
In short i'm trying to use requestType in Automation. Its always coming blank.
Here's what i've tried:
Project: Team managed JSM project
Created a test automation to run as an action on the issue:

On checking the audit log after triggering - no values are returned:

One piece of advice i found is that you cannot use requestType in automation if it isn't in your edit screen. This is a team managed JSM project and as such you can't add the requestType on the edit screen.
I've checked on the project settings > request types > add request type > Fields - and request type isn't available to add.

I've just noticed we have automation working in a different project for request type that is working.
