Auth0 Lock:v12 not returning requested scope

Hi, I’ve been trying to login with a set of scopes via lock.

this.lock = new Auth0Lock(clientId, domain, {
        oidcConformant: true,
        audience: 'myApiAudienceValue',
        auth: {
          redirect: true,
          responseType: "token id_token",
          params: {
             scope: 'read:users write:posts',
        loginAfterSignUp: false,
        container: 'lock-container',

I was able to login, but it always return scope: null
I tried to log my request via the postLogin:action, the audience and scope value I’m sending was not there.

  • I’ve made sure to add the read:users & write:posts into my API permission list

  • I’ve made sure that the audience is the API identifier

  • I’m using the app id that’s authorized to the API

  • The scope take effect if I omit the audience option and set scope to one or more of openid, profile or email

am I missing something?