Problem: 

When you try to enable Alexa Functionality on an Android device you get the error message "Enable Alexa failed" as soon as you choose an account type (for example Amazon) to type your credentials.


Solution:

Actually we are investigating on this Problem and hope to solve the Problem with a new Version of the Zehnder Comfo Control App made available for you beta testers in Play store app. 


Solved: With the Android Version 1.5.0.4 (61) the problem is solved.  You can Download this as beta user from the google play store.