Hiya! Welcome to the Netlify Forums. Sorry you are having trouble getting your forms to work.
This Support Guide is the first port of call to debug any forms issues. I know you mentioned you read every related support cause, but I wasn’t sure if you were referring to Support Guides or not. Please start here and work through these resources if you haven’t seen them!
If you are still having problems, please the information we ask for in this guide:
The URL for your live form as you want visitors to use it
The form name that you’ve set and that shows in our UI (it looks like this is contactForm based on your post above)
Any errors or logs from the Netlify build logs, dashboard or browser developer console
Description of anything you have tried that did or didn’t help or make things better/worse
I’m not exactly sure what to show you here. It is in my index.html file but in that deploy it seems Netifly does some magic on that?
No relevant errors noted