Beta test Alexa skill doesn't work anymore

Hello Team

I have been a beta tester for the amazon skill. But from a few days ago I will not able to use this skill anymore over the alexa. And yes I have used this skill for a few months over the chinese server in the mi home home app and also on the yeelight app. But now the diveces apears not available…can you please let me know why?

Thank you and best regards

I have tried to install itunes on windows 7 and it was the beta version but it was not working at all so please help me to fix the problem. I was looking for the fix of the iTunes and tried with the stable version still the same.