SSO using JWT tokens issued by AWS Cognito

Has anyone got SSO working with Jaspersoft Server using JWT tokens issued by AWS Cognito?

When requesting a report we can authenticate with a jwt token, but get redirected to the configured Jaspersoft homepage, rather than getting the report requested

We're requesting the report via visualize.js, but the callback never fires because we get redirected to the Jaspersoft homepage.  I feel that the server treats it as a login, rather than just authenticating the request itself.

FWIW, here is a good resource if you're looking at implementing this yourself. 

Jasper Oauth Configuration

  visualize({
  auth: {
    token: authToken,
    tokenName: "code"
  }
},
  function(v) {