Google Chrome: DOMException: Registration failed - manifest empty or missing

For me it was a redirect. The manifest.json must return a 200 status code (must be directly available from the server), without any redirects. You can check the response via

wget --max-redirect=0 https://example.com/manifest.json

or

curl https://example.com/manifest.json

I faced same issue,added manifest file right after head tag . which worked for me.Cheers!