Alexa Media Player with problem

I got a new Alexa in my house and it got not automatic discovered so I decided to remove the Alexa media player integration and install it new. email and password are tested and correct, install with works but all devices are greyed out, maybe because I am registered with Germany. But I want to use but that it not working, just trowing unknown error message. I was just testing with and install works here but not with

Anyone else has this problem or know what the problem is and how to solve it?

Could solve it on my own. Needed to manually delete the config file for Alexa media player in storage. It was not deleted with remove of the integration. After deleting the file it was without problems possible to setup new.

Hi, where is store this file? What is it name?