Problems with antitheft function

I have a subscription to AVGtune up and the Antitheft function, but I am unable to use the latter.
There is no connection possible between my android device and the home computer. How do I do this? I have gone several times in the prescribed way to unlock the antitheftfunctions but it always ended  with 'no connection possible with the device 

Hi Jacques, 

We have replied to your original post: https://support.avg.com/answers?id=9065p000000PwWo
Keep up the conversation through single thread in order to get quick assistance.
Thank you.