@HeatherT thanks for this - I originally had set the form settings to display an inline message and added the redirecturl in the embed code (as someone in this thread suggested).
I have now updated the form and done the same as you: I’ve added the redirect url in the form under “What should happen if a visitor submits this form” > where I’ve selected an “External link…” and added the url there.
I’ve also added the code you sent over to the page - thanks for sharing it.
However, the form data is still not appended to the redirect url, but instead a submissionID is appended (?submissionGuid=2e7ac3a9-0a94-4c79-8530-18e5f6a1e405).
Do you have any idea why this is?
Thanks again for your help so far.