I’m writing it down this time — after completing the steps to set up xrdp (installed, configured, running, firewall port open), we get prompted for credentials … good so far!

And then get stuck on a black screen. This is because the user we’re trying to log into is already logged into the machine. Log out locally, and the user is able to log into the remote desktop connection. Conversely, attempting to log in locally once the remote desktop connection is established just hangs on a black screen too.