Hiya @bmorrisondev and welcome to our community! I think based on your report that you’ve read this article:
…but seeing a a 404 for a POST (the only means of form submission we support) means we have not processed your form correctly, so you need to keep working on getting it detected. If you can put the method=POST (or remove method entirely) back in it, it looks like it might be correct, except that your content-type is incorrect and the article will show the correct one.