"Unable to join the network" error on iOS devices

I have a Linksys WRT1200AC router running the latest 21.02.3 version of OpenWRT, and since installing I've not been able to get my iPhone 12 to connect to my Wi-Fi even though other devices are able to connect. I've tried setting my 5 GHz band to 40 MHz as well as forcing 40 MHz mode after reading a thread where this solved the issue, however mine persists. Right now I have a 5 GHz band set to 40 MHz AC with auto channel selection, and a 2.4 GHz band in mode N, also with auto channel selection. Both have WPA2-PS/WPA3-SAE Mixed Mode enabled. Any other things I can try?

I think I've seen that issue before due to WPA3.


Ah yep, that fixed it. I thought I had tried changing that before but evidently not. Thanks!

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