[WLUG] RDP into Win10 with Remmina

I'm getting tired of booting into Windows for work. I figured out how to connect to the VPN from Debian, but it would be very helpful to RDP into the workstation in my office. I know the URL for my workstation, the domain, the username, and the password, but I'm failing to get it to work. What should I try? Remmina says "Connecting to <server>..." for a minute, then fails with "Connection to RDP server <server> failed." -- Rich