Did you try Resetting your Network Connections?
Open Settings & Search for "Reset" and click on "Reset Network Settings".
Reboot and try to connect with WiFi 6.
Hi, as suggested by the RedDogRabbit please try to reset network settings on your phone.
1. Go to Settings, and then select General management.
2. Find and select Reset.
3. Choose Reset network settings.
4. Tap on the Reset settings button.
5. Tap on the Reset button.
Note: When you reset the network settings, the Wi-Fi information connection are reset.
I have the same issue with Samsung Tab s8 Ultra. I cannot connect to wifi 6ghz. Everything was working fine before the November 2022 update. 5ghz is working fine. I can connect to my wifi 6ghz with my Surface pro 9 and my PC without any issue. I tried everything, reset network connections, static IP ... but same issue, incorrect password with Samsung Tab S8 Ultra.