Rules and first login

Works exactly as intended, thanks a lot !

Here is my final rule code :

function (user, context, callback) {
  user.app_metadata = user.app_metadata || {};
  // You can add a Role based on what you want
  // In this case I check domain
  var addRolesToUser = function(user, cb) {
    if (user.email.indexOf('@myDomainName') > -1) 
    {
      cb(null, 'admin']);
    } else 
    {
      cb(null, 'user']);
    }
  };

  addRolesToUser(user, function(err, roles) {
    if (err) 
    {
      callback(err);
    } else 
    {
      user.app_metadata.roles = roles;
      // *** New line below ***
      user.roles = user.app_metadata.roles;
      
      auth0.users.updateAppMetadata(user.user_id, user.app_metadata)
        .then(function(){
          callback(null, user, context);
        })
        .catch(function(err){
          callback(err);
        });
    }
  });
}