I am able to get the solution to work on a simple 4 question demo survey, but on our complex multistep, multilingual survey the text does not autofill.
This one works: (Simple Demo Form)
https://ee.humanitarianresponse.info/x/a0AzLVMJ/?&d[long_form]=JohnnyKnox
This one doesn’t work: (Complex Multilingual Form)
https://ee.humanitarianresponse.info/x/zlYAIji4/?&d[biz_owner_name]=JohnnyKnox
I checked the attributes and the attribute is right in the second one: