Sorry it looks like Mi ID above was incorrect.
Please refer to this correct one: 1645309511
OK, I found it. one desk lamp and one bedside lamp.Please use 1645309511 login on Google Home app to sync devices.
Thank you! All works now.Just in case other people have same issue (if you have more than one mi account).
There are two parties asking for your permission twice, the 2nd time is the one that you need to make sure the correct mi account is set.