Hello this is happening to me too. First it started with netlify login not working and doing the same thing:
Page not found
Looks like you’ve followed a broken link or entered a URL that doesn’t exist on this site.
If this is your site, and you weren’t expecting a 404 for this path, please visit Netlify’s “page not found” support guide for troubleshooting tips.
Then now I just deployed my website : servicesatmydoor.netlify.app and it is doing the same thing. It is a successful build btw.
Could netlify is having a bad day ?