In Step 2 of configuring the server, it says to edit the /etc/systemd/system/vncserver@.service file; replacing USER with the actual user name.
So I run ExecStart=/sbin/runuser -l myuser -c "/usr/bin/vncserver %i -geometry 1280x1024" PIDFile=/home/myuser/.vnc/%H%i.pid having replaced USER with my account and I receive the error “sudo: myuser: command not found”
If you’re using Fedora Workstation (Gnome), I believe it already shipped with minimal vnc server. You can enable it with “Gnome Settings” → “Sharing”. Enable it and also enable the “Screen Sharing”. Then open “Connections” app and type the IP address to test. If you’re not set the password, you need to accept the connection each time there an incoming connection.