Light not being added from Home app on iPhone

I have used two lights before (first to Yeelight app and then later to HomeKit app). But now I got two new lights, and when I connect to their Wi-Fi, I am automatically redirected to add them to the HomeKit app (so I am not able to add them to Yeelight app directly).
But when I try to add them to the Yeelight app from Home app, they are never imported. I am very frustrated, since I can’t use all the function I have on Yeelight app.