Yeelight not discovered by Alexa

Good morning everyone.
First of all, sorry if my English is bad (I’m Italian).

I have a problem, yesterday I changed the password of my mi account, I deleted a bulb from the Alexa app and then I reconnected the skill (yeelight) with the alexa account.
Now Alexa can’t find the bulb anymore.

I can see it and use it in the Yeelight app, I’m using the european server and all the other bulbs that were previously connected are working just fine…

Amazon support says it’s something on yeelight side but I tried literaly everything…
Even changing the skill with the xiaomi home (no luck)

I don’t know what to do…