Zendesk Add Ticket Activity - trouble adding variables into the description field

Hello all,
I hope this is the right place to post this?? I could use some help. I am trying to use the Zendesk Add Ticket activity to create ticket with a description that pass 2 dynamic variables. 1) termedUserName 2) emailForward.

Here are my parameters from the activity:

When I run the command, it get the following errors:

Error 1: {“error”:“Unprocessable Entity”,“message”:“Server could not parse JSON”}
Error 2: {“ticket”:{“requester_id”:"",“subject”:“Termination - Efax”,“description”:“Terminate Efax account for” +termedUserName+ “and forward faxes to” +emailForwar"}}

For testing purposes I put in values for the variable fields shown below.

I was hoping someone could help me figure out what I am doing wrong. It creates a ticket a ticket if I put plain text in for the description.

Much Appreciated.

Krista