I know it’s quite windows style issue managament but… did you reboot?
Also: would you please detail us the network card used by your computer? Via console/shell use
lspci |grep Ethernet
this is the output of my test server (single NIC)
1e:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM5723 Gigabit Ethernet PCIe (rev 10)
This is an experience I had with other hardware for realtek cards.