Connect to wordpress instance on private network

I am self-hosting a WordPress instance internally for my organization. When I enter the URL of that site into this app, I receive an error message:

Check that the site URL entered is valid

From there, I can look at the Logs, which have reference to the REST endpoint mentioned on this line:

https://github.com/wordpress-mobile/WordPress-Android/blob/5385671ec11ba90d3127a7904bfeb6ccac17f3b9/libs/mocks/src/main/assets/mocks/mappings/self-hosted/rest_v11_connect_site_info_self-hosted.json#L4

Specifically, it seems that the app is connecting to an endpoint at https://public-api.wordpress.com/rest/v1.1/connect/site-info/?url=[private site url]

This suboptimal, because

1. It discloses the location of the private site to WordPress's REST API; and
2. The site is not accessible from the public internet, so presumably the REST API returns an error message to the Android app client.

Is there a way to use this app with a privately hosted WordPress instance?