@ahahlberg I have a temporary fix - I used my wife's Pixel 5 phone to set up the KASA account and then was able to do a straight login on my Samsung phone. So it's definitely a compatibility problem...

I have a Kasa Smart Wi-Fi Light switch with the dimmer function model HS220(US). On my Samsung Galaxy S8+ phone when I try to create an account in the Kasa app by selecting "Create Account" button I...