I have an IoT network setup for 2.4GHz only since many devices require only 2.4GHz. The security is WPA/WPA2. I have smart cameras, smart TV, smart door bells, etc. connected already on IoT network without any password issues. 
But I have 2 devices which won't connect due to "incorrect password" or "bad password" error. 
1) Sleep Number bed - the password is sent to the bed via their app, it connects fine with iPhone (iOS 26.3) hotspot

2) Chromebook (Lenovo) - WiFi works at school network, but it doesn't connect at home. I have not tried with iPhone hotspot yet.

Any help and assistance are very much appreciated!

I also tried them with guest network with 2.4GHz only with WPA/WPA2, and no luck.