Can't connect bulb after changing wifi

Yeelight LED Bulb (Color)
#1

I changed my wifi’s name and password to make it more secure. I opened ssid isolation and closed wps now i can’t connect my bulb. I tried changing dns to 8.8.8.8/8.8.4.4
I can connect with hotspot.
I dont see bulb mac at dhcp list
Version: 2.1.7_0036
MI ID: 6358696753
What i know is my yeelight led bulb 1s (color) stops sharing wifi while connecting.

#2

Would you like to help?

#3

Changed server to Singapore, checked the wifi password, lowered security, closed 5ghz ssid (only 2.4 ghz). And then it worked, i don’t know which one.