Alexa does not find yeelight anymore

After upgrading from Xiaomi Mi A1 top A2 i reinstalled the yeelight App and got asked top so a Firmware-Update For The ceiling light and my light bulb 2 which i did.
After that Alexa was able top Control the Lights anymore. I deleted both and searched again For new devices but Alexa Cant find any. Switched top singapore Server but also does not work. Yeelight App still works and i successfully reinstalled several Times but Always No luck with Alexa.
Can anyone Help me?
ID ist 1834202030