refreshToken every time null

[mohammad-aljamil]

Checklist

• The issue can be reproduced in the auth0-js sample app (or N/A).
• I have looked into the Readme and Examples, and have not found a suitable solution or answer.
• I have looked into the API documentation and have not found a suitable solution or answer.
• I have searched the issues and have not found a suitable solution or answer.
• I have searched the Auth0 Community forums and have not found a suitable solution or answer.
• I agree to the terms within the Auth0 Code of Conduct.

Description

the refreshToken every time return null

i Enabled offline_access from app settings

this.auth0 = new auth0.WebAuth({
      domain:'AUTH0_DOMAIN',
      audience:'AUTH0_API_AUDIENCE',
      clientID:'AUTH0_CLIENT_ID'),
      redirectUri: window.location.origin + '/callback',
      responseType: 'token id_token',
      scope: ['openid', 'profile', 'email', 'user_metadata', 'offline_access'].join(' '),
    });
    
      silentAuth = () => {
    return new Promise((resolve, reject) => {
      this.auth0.checkSession({}, (err, authResult) => {
        if (err) return reject(err);
        if (!err) {
    
          resolve(authResult);
        }
      });
    });
  };

this json

{
    "accessToken": "xxxx",
    "idToken": "xxxxx",
    "idTokenPayload": {... details }
    "appState": "xxx",
    "refreshToken": null, 
    "state": "xxx",
    "expiresIn": 7200,
    "tokenType": "Bearer",
    "scope": "openid profile email offline_access"
}

when used react auth0 i can get refreshToken

Reproduction

1-silentAuth

Additional context

No response

auth0-js version

9.26.1

Which browsers have you tested in?

Edge, Other