Sorry to jump on this. I am on a new provider now and I can see all the 404 errors (thanks to Kinsta) and favicon.ico is the top error I am trying to resolve.
My site identity is all resolved according to the options so I am curious why I am still getting the error. Is there a hardcoded wordpress call for an ico file?
As far as I know, browsers will try to find the favicon.ico if no icon is set in your <head> area. Did you upload an icon in Customize > Site Identity?