I believe the issue is that you're trying to assign a text entry to a numeric variable value. Replace your text entry field with a numeric entry field and it likely will work.
Steve, thank you!! This is where I was going wrong! I replaced the Short Survey Answer slide with a How Many slide and can now see the variable.
Now I just need to test I can see the data reported on our LMS. I've noticed the 'How Many' survey question, doesn't automatically jump to the next slide when the trigger submits the interaction when timeline starts, whereas it does for the Short Survey questions. Not sure if this is intended but as long as it reports to the LMS I don't care.
I want to confirm Steve's answer was the solution I was looking for! I changed the Short Survey (Text Entry) Interaction to a How Many (Numeric Entry) Interaction and could display the numbered variables and report the data in our LMS.
For anyone interested here are the triggers I used.
