title: Access token is null in Msal response-Azure AD B2C
body: <p>I have an SPA Vue.js app, using msal.js to connect Azure AD B2C to get the Id,access token and use the access token for furthur call to my APIs(which is a .net core webApi). So far I was using built in user flow and now I have to change to custom policy. I figured I don't get access token through custom policy.
  Access token is null in msal response.</p>
  
  <pre><code>onToken:(ctx,error,response) =&gt; ...
  </code></pre>
  
  <p>I have defined my default scope in the SPA and Azure. If I run the custom policy in Azure AD b2c and set the Access token and select jwt.msas reply Url, I am able to see the access token in response. So I think there is nothing wrong with the custom policy. So it looks like I need to do some additional call with msal to Azure and get the access token.
  I couldn't find any good document and I already tried AquireToken in msal, and it didn't work.
  I am not sure if I have to set the response type in the initial msal authentication call to 'code, id-token' or 'id-token token'? Or how to do that? and If not what can I do to get the access token as I am in front-end and using implicit flow.</p>