Getting User Permissions During Login Action for Native or SPA

I’m trying to access user permissions during a post-login Action. After looking at several different topics, I have this.

exports.onExecutePostLogin = async (event, api) => {
...
  const ManagementClient = require('auth0@2.23.0').ManagementClient;

  const management = new ManagementClient({
    clientId: event.client.client_id,
    clientSecret: event.secrets.client_secret,
    domain: event.secrets.domain
  });

  const params = { id: event.user.user_id, page: 0, per_page: 50, include_totals: false };

  let userPermissions = await management.getUserPermissions(params);
...

I am getting an “accessDenied” error on the call to getUserPermissions. After some more poking around, I see indications that I need to go to the settings for the Auth0 Management API and grant the read:users permission to my application. The catch is, I’m trying to log in with a Native Application, not M2M, so I don’t have a way to grant that permission. Is there a way for a Native App or SPA to use the ManagementClient during a Login Action?