Hey Eva — apologies for the delay in getting back to you. Unfortunately, I’m scratching my head as well in regards to why the changing of the form action isn’t working.
I have a decent feeling that it is to do with the unbinding of Webflow’s default form handling (see forum post here), but I’m not super familiar with the specifics to be completely honest.
Maybe @cyberdave or someone else knows how to resolve this? I wish I could be of more assistance!