Hey, so basically I am having identical problems to the issues brought up on this thread: https://forum.arduino.cc/t/arduino-nano-iot-not-connecting-to-wifi-at-all/997957/16. The only real difference is that I've tried connecting my Nano 33 IoT to my guest WiFi network (using the example code in the library for WiFi NINA) with no different results than when trying to connect to my WPA2 WiFi network. I was doing some looking in the code under WiFi.h at what it does when you run the function WiFi.begin(ssid). I came across the following:
It mentions in line 79 something about "Valid characters in a passphrase must be between ASCII 32-126 (decimal)." I don't really understand what it's trying to say there, but I'm wondering if something about my WiFi password is interfering with the connection it is trying to make. This wouldn't explain why it can't connect to the guest network, but I'm kind of out of guesses at this point.