User Metadata is Not Correctly Updated from a Rule

There are no errors after login execution, but the metadata is empty.

• User Metadata
• Rules
• app_metadata

Data is not persisting if you don't resolve the Promise.

Troubleshooting

Check when and how the rules are trying to update metadata.

Rules using the function updateUserMetadata() triggers an asynchronous call that needs to be resolved. You'll be expecting no errors since this function will end with a pending Promise. Here are a few examples in our documentation:
https://auth0.com/docs/manage-users/user-accounts/metadata/manage-metadata-rules#update-metadata

As you can see in this snippet, it's needed to handle the Promise with "then" and "catch" to persist the data:
 

function(user, context, callback){
  ...
  auth0.users.updateUserMetadata(user.user_id, user.user_metadata)
    .then(function(){
      callback(null, user, context);
    })
    .catch(function(err){
      callback(err);
    });
}