iPhone 12 mini not Connecting to Wifi Channel 35-48

In my household, I have 3 iPhone 12 Mini using the most current iOS 14.2. My wifi router is a Netgear Nighthawk X6 7900, which has 3 bands: 2.4Ghz, 5 Ghz channel 35-48, and 5 Ghz channel 149-161. All the iPhones can connect wirelessly to the 2.4Ghz and 5Ghz channel 149-161. However, one of the iPhone will not connect to the 5Ghz channel 35-48. It always returns "Password is incorrect". I am 100% sure that I am entering the password correctly and I am within range (<10ft) from the router. Does anyone have the same problem? Any suggestion for a fix?

P.S. Some may think it is not a big deal since it connects to the other bands, but when you pay $700 you should expect that all features function correctly.

thanks.

CB