Choice Field Custom Attribute in body of Create Second Ticket Web Service Method Autopopulate from original ticket.

Good Morning again, and hopefully the last time for a while,

In the Create Second Ticket Web Service method, I want to pull a custom attribute choice field filled out by the end user over to the new ticket.

Ex. I have a drop down Choice for Computer OS. If the end user selects Windows from the dropdown, I want that information to be brought over to the new ticket. 

The Body line in the body is: { "Name": "Operating System No Workflow", "ID": 18612, "Value": "{{OsChoice}}" }

The Parameter is: Name-OSChoice, Datatype-String, Source-From ticket, Source Property-OperatingSystemNoWorkflow

Method URL: https://skidmore.teamdynamix.com/SBTDWebApi/api/154/tickets

When I run the method individually and manually input the choice ID for Windows, the new ticket is created with the Windows option selected in the dropdown.

When I run the method in the flow, the field does not populate at all in the new ticket.

Sincerely,

Irene