Connection Time out when connecting to MIHome

I had some offline issues so i doss connect the device from the MI Home.
After reset the “Yeelight Celling” (5 times On-Off) I try to connect it sing MIHome App.
The connection process starts, than the light starts to flash, and I get “connection timed out” asking me to try again .
then I cant see the device till I reset it again.
My Server Is Homeland
Please could you advice?

Since you can see the lamp to connect, it means the wifi module of the lamp is ok. Please help confirm two things:
1、Have you ever succeed with the connection?
2、Could you help to check if the lamp in your router’s DHCP list after connection time out?