Yes, the plugin works with WP Umbrella but their connection is still made through the login page.

You can setup a custom login path using WP Ghost but you need to set the following option:

  1. Switched OFF the WP Ghost > Change Paths > Login Security > Hide “login” option .
  1. Set the same REST API path on WP Ghost and WP Umbrella settings
WP Ghost > Change Paths > API Security
WP Ghost > Change Paths > API Security
https://app.wp-umbrella.com/ (Sites > Settings)
https://app.wp-umbrella.com/ (Sites > Settings)
  1. Confirm the new paths and clear the cache on your website.