Windows 11 could still be involved if you are up to date on those updates.  There have been a couple of updates lately causing problems for folks for various reasons.  I expect something fairly soon to solve that situation. Dell also has a history with the (Intel) Killer Wireless cards.  I have tested those, not the 1650s, but they seem to be reliable to me.  It appears the 1650 is a CNVio interface so it may depend on your systems chipset drivers. Just to see if it will run without showing errors, you might try the command below in an Admin command prompt. netsh wlan show drivers I have run an AiMesh configuration from time to time and the router's 5 GHz SSID should show up just through that, assuming it is allowed to broadcast.  If it isn't showing up on your system, you might try the WPA-3 Personal and see if it makes a difference.  I know my 6 GHz radio does not show up in Windows 10 due to authentication problems.   It looks like you have done pretty much all you can to resolve the situation.  You probably are dealing with the Killer Performance Suite and the drivers but if you aren't showing a code 10 on the device in Device Manager, it should be functioning.  
Hello, My Dell XPS 9500 is no longer able to connect to my home WiFi or guest WiFi 2.4ghz networks. It doesnt even identify my 5Ghs bands. Interestingly enough it connects to my phones hotspot with no issue.  When I try to connect to my home wifi, it asks for the password, tries to connect for several moments before giving the message "unable to connect to network." Following troubleshooting steps performed: 1. Power cycle 2. Ran Dell support assist "run all" and updated all firmware and drivers. 3. uninstalled and reinstalled the Killer network driver from the dell website   What else can I do?
Unable to Connect to Home WiFi. Able to connect to personal hotspot though