I succeeded to connect my Android phone (Android 7.0), all three applications operate well on the phone (Avast Mobile Security, Avast Cleanup and Avast Secure Line VPN).
But there is another problem: The mobile device is not included in the list of covered devices when looking at my Avast account.
Therefore one of the key function is worthless - the Anti Theft. How can I command the mobile phone when it is lost, if this device is not visible in the Avast account at all?