I have followed the documentation for accessing smart values for list items and have tried all the different variation shown here:
Use Smart Values to Access Listed Values
I also tried testing by having it write a log and it's not working.
The custom field is "Environment" and my selections are:
Production
UAT
Test
Development
I check the log and it says success and the result is this:
Here is a snippet of one of the smart value code I used:

The flow is this - A user fills out a support request form in the portal choosing the type of "Environment" and submits. This is then in the body of the ticket of JSM. I'm trying to access this checkbox value to populate into a Slack channel message. No matter what I try, the response is empty.
Thanks!