Android App (An error has occured)

Trying to login to a locally hosted vault. Can login from the server from a browser. Can login from Windows 10 from a browser. Can login from the phone from a browser, but cannot login from within the android app. “An error has occured. There is a problem connecting to the server.”

Anyone have any idea in the direction I should go to troubleshoot this problem?

Sounds like a cert trust problem. Android apps have more cert requirements than others.