Can't connect bulb after changing wifi

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
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.

Would you like to help?

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.