On Submission, netlify server respond with 404

Thanks for reaching out about this! Sorry that you are having trouble getting your form submissions to work.

This Support Guide is the first port of call to debug any forms issues. I see that you mention you have read the Docs-- have you also read out Support Guides? If not, please start here and work through these resources!

If you are still encountering obstacles after reading those, please share a link to your live form, your form name as it exists in the UI, your project repo, etc.