Hi, this is not a question but a sharing of my finding for netlify-auth-provider.
I strugled many hours trying to make work the sample on localhost as in
oauth-provider-tokens/#setup-and-settings
the javascript code needs to be changed :
var authenticator = new netlify.default ({});
must be
const authenticator = new netlify.default ({'site_id':'SITE-ID-HERE'});
SITE-ID-HERE is the netlify app site-id that can be found using
ntl status