I am stuck with Alexa configuration account linking

Hi, i have an home assistant istance in my office previously working with Alexa smart home skill with lambda and amazon developer account that non working anymore. The lambda funcion works perfecly if i click test i can see the json with all of my devices, the issue is in account linking, in the app i try to connect skill, i can see home assistant login page, i enter username and password, it wait for some second and a error appear “Unable to connect, please retry” I haven’t error about uri redirection, this istance is located in Italy so i have use “Ireland” in AWS lambda and i have used https://layla.amazon.com/ as client ID. I use nginx proxy but i cant’see anything in his log about this. There is a way to debug this? I use this method in all of my homeassistant istances i never had this problem before.

Thank you.