Comment 10 for bug 1876884

$ journalctl -f
May 05 14:32:30 work-pc1 gnome-control-c[2052]: Failed to enable service vino-server: GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs: Sharing cannot be enabled on this network, status is '0'

$ nmcli d status
DEVICE TYPE STATE CONNECTION
enp2s0 ethernet unmanaged --
lo loopback unmanaged --

$ /usr/lib/vino/vino-server

05/05/2020 15:10:09 Autoprobing TCP port in (all) network interface
05/05/2020 15:10:09 Listening IPv6://[::]:5900
05/05/2020 15:10:09 Listening IPv4://0.0.0.0:5900
05/05/2020 15:10:09 Autoprobing selected port 5900
05/05/2020 15:10:09 Advertising security type: 'TLS' (18)
05/05/2020 15:10:09 Re-binding socket to listen for VNC connections on TCP port 5900 in (all) interface
05/05/2020 15:10:09 Listening IPv6://[::]:5900
05/05/2020 15:10:09 Listening IPv4://0.0.0.0:5900
05/05/2020 15:10:09 Clearing securityTypes
05/05/2020 15:10:09 Advertising security type: 'TLS' (18)
05/05/2020 15:10:09 Clearing securityTypes
05/05/2020 15:10:09 Advertising security type: 'TLS' (18)
05/05/2020 15:10:09 Advertising authentication type: 'No Authentication' (1)
05/05/2020 15:10:09 Re-binding socket to listen for VNC connections on TCP port 5900 in (all) interface
05/05/2020 15:10:09 Listening IPv6://[::]:5900
05/05/2020 15:10:09 Listening IPv4://0.0.0.0:5900

also what interface is the settings panel listing at the bottom is that your correct eth one?
The "network" part of the settings panel reads: "Es sind keine Netzwerke zur Freigabe gewählt." (german locale) which can be translated to "No network has been selected for sharing".