CORS issue with native app using ionic from serve from localhost

Help
1

I am using to get refreshed access token by calling ‘https://.auth0.com/oauth/token url . but i am getting error
Access to XMLHttpRequest at '[https://.auth0.com/oauth/token’ (https://***auth0.com/oauth/token’) from origin ‘http://localhost’ has been blocked by CORS policy: Request header field access-control-allow-origin is not allowed by Access-Control-Allow-Headers in preflight response.

I checked my application setup in Auth0 and i have added http://localhost to
Allowed Callback URLs
Allowed Web Origins
Allowed Origins(CORS)

But still getting above error.
I am using Ionic 4 and ionic Auth Connect plugin or Auth0 integration.

I went through other similar posts in Auth0 Community but didn’t get any clue apart from above settings which are already in place.
Please provide some insight.

P.S - I am able to test and same request using Postman and i am getting results back.

2

Did you fix it? I have the same/ How did you solve it

3

We found that devloper was calling refresh token method unnecessarily. the plugin IONIC AuthConnect refreshes token by itself when acess token expired. We removed extra calll . So we didn’t need to fix it.