Localhost and CORS with Auth0 won't let me login

I am making a React app and am trying to use Auth0 for authentication. After trying to login, it returns this:

XMLHttpRequest cannot load https://my-domain.auth0.com/usernamepassword/login . Pre-Flight Request Response Fails Access Control Check: The value of the "Access-Control-Allow-Credentials" header in the response is ", which should be" true "when the request credentials mode" enable ". Origin ' http: // localhost : 3000 'is therefore not allowed The credentials mode of requests initiated by XMLHttpRequest is controlled by the withCredentials attribute.

I thought it would be related to this: CORS issues with Auth0 and React , but I have both Auth0http://localhost:3000, http://localhost:3000/login

in the Allowed Origin (CORS) field (and yes, I am also using the correct client id).

I tried putting http://localhost:3000/, http://localhost:3000/login

in "Allowed Callback URL (not sure exactly what this does), but that didn't work either."

When I use social link (google) it allowed me to login after posting http://localhost:3000/login

in allowed callback urls.

But it still won't work just for new user login.

Any help?

If it matters:

• Auth0 logs show up for social login, but no logs at all when I connect differently

• I think it has something to do with the fact that I also get this every time the page is loaded:

  Failed to get SSO data. It could simply mean there is a problem with the network. But, if an "Origin" error was logged before this warning, add " http: // localhost: 3000 " to "Allowed Origin (CORS)" in the Auth0: ... dashboard (link to my dashboard)

• I am getting 404 from gravatar website

• Also I am getting these errors (possibly unrelated):

Refused to set unsafe header "accept-encoding"

Refused to set unsafe header "user-agent"