Yeelight Crystal Ceiling Lamp not discovered by Alexa

After being happy with my first Yeelight Crystal Pendant Lamp, I bought a second one. And this new one is working fine (can be adjusted in the Yeelight App) except that it will not be found by my Alexa.

I tried everything I can think of. And I already talked to Amazon Support and followed all their steps, so now they say the problem must be in the skill and I should talk to the manufacturer.

Appreciate any advice!

(Model: yeelight.light.ceiling10 / Mi ID: 6254288406 / Server: Europe & Africa)