Internet client error: authentication failure

Hi all, I just setup urbackup and am trying to setup a remote client to backup across the internet. I created the client package from the server and installed it on the client (windows 10 pc) and when I open the client it says: "Internet connection status: Error: Authentication failure: Unknown client (machinename). I made sure the password was correct, and even changed it, both in the client settings and server settings for that system. Has anyone ever had this issue? Thanks!