@knoxjohnny, you could do it as outlined in the image shared below by adding ?d[Q1]=Apple behind the survey URL. Note, Q1 is the variable name for the survey project shown in the example.
Hi @knoxjohnny
Do you mind sending your XLS form so that we can look at it? It seems that this name may be having an issue.
The hypothesis that I need to test:
Use of an underscore in the name does not work with prefill ( testing approach; change the name to staffname)
Prefill does not work with a long-form (testing approach; remove all other questions except that one and test)
I have the same problem. The URL fill works in a test form but the same syntax does not work in the existing form that I need to change. Were you able to find a solution to this?
I found the source of the issue in my case. The existing form has sections, so rather than just passing the value to [country] I have to pass it to [intro/country].