Adding External switch using laptop's wifi-card (AC-8260) errors out.

Hi. New member and new to Hyper-V here.
After seeing WSL-2 availability in Windows 10 2004 release, I decided I will also give hyper-V a try. (I have been using VirtualBox but VirtualBox does not play well with WSL-2)
Turning on Hyper-V and adding Linux Mint was straight forward. I followed the instruction and the VM seem to work fine.

I added external switch to wired Ethernet adapter. As long as Internet connection is through the wired connection, I can see my Mint VM as 192.168.1.21. (Host machine's IP is 192.168.1.20)

My Wifi uses 'Default Switch' It uses NAT so I cant get a unique local IP assigned, like I do when I use wired bridge.

So I thought it would be just a matter of adding External Switch assigned to the wifi and use it in place of 'Default Switch', but when I try to create one, it goes to process the request for about a minute and then display error dialog which shows 'object not found' error.

What am I doing wrong? Do I need to unbind Default switch from Wifi card first? if so, how do I do this. From other thread, I understand 'Default Switch' can not be deleted.