Lightstrip Plus not detected from Smart Home

Hi everyone

I have recently try to install my Yeelight lightstrip Plus using Smart Home app, as MiHome is no longer available for Android.

I have already installed 2 different sets of light bulb from Yeelight and can now control them with Alexa, so I expected the process to be straight forward.

I tried to add manually the lightship going to Lightning-> Strip Light, but then when the app ask me to switch it of/off x3 until it blink, the strip doesn’t blink.
I tried also the AP method, but nothing, the strip doesn’t blink.

As I said before, this process worked for my light bulbs but not for the lights trip.

Any suggestion?

Thank you