Mi Bedside lamp 2 can't connect

Hey, I purchased Mi Bedside lamp 2 about 2 months ago and forgot to connect it.
I have been trying to connect it for a few days and it seems not to work.
The error is when I try to connect it’s trying to connect to the wi-fi but after a few seconds, its says connection time out.
I am sure that I am connected via my phone to a 2.4 wifi network.

Things that I have tried:
changing wifi password and name
Hotspot with 2 different phons
using both yeelight app and mi home app

also, I cant see the lamp connected in my router settings Home Network View

Thanks for the help.

maybe there is something wrong with the device.
we suggest to exchange goods.