I have an enterprise network running on Cisco Wireless lan controller. Its upgraded to Wifi6 which is a rather big problem. Since upgrade to Wifi6, the newer Macs wont connect to WPA2 enterprise with username/password. On an open WIFI they connect fine. Older Macs connect fine to the network. because they negotiate an older connection type. What i have found is, that MacOS and Linux (basically the same) cant agree on the band they want to use for 5 GHz network. The result is rather obscure as the operating system returns with a "wrong password or username". This is wrong. On my wireless router i dictated the frequency band to be used (thus no negotiation) and the machines connected flawlesslys to the network. This workaround isnt usable for Cisco enterprise networks because of the manu AP's running different frequencies, as to not jam each other. If you have a private router, find an available frequency specrum and fix your wireless to that band as a work around. I cant give you the solution for this as there is a ton of different routers out there. On enterpise networks managed by a wireless lan controller we will need a driver and protocol stack, that can handle this envirenment properly. Apple, please look into this.