I recently purchased the Yeelight bulbs.
I have a problem to connect them, I’m in a residence and to connect to WiFi with an account, you need a username and password. The application does not support this type of connection. I also tried to share my 4G of my phone but couldn’t detect them.
The bulb can only work with a router using WPA/WPA2 encryption method with a password. The router must connect to the internet and can’t let user type userid/password to login.
You can find another phone and setup a hotspot, then connect the bulb to the hotspot.