I recently purchased Avast Ultimate 2020/5 devices. I installed it on three of my computers already without any difficulty. I did not even have to utilize my activation code. Today I tried to install and activate it on my mobile phone with Android. I found a premium and ultimate. I chose Ultimate and chose Already Purchased in the upper right corner. I put the activation code provided on my confirmation order. I got an Invalid Message every time I tried to use it. I am sure I put it in as it was provided to me (printed out). My question is what are the steps I need to install and activate it on my mobile phone? It was easily installed on my three computers. Thanks.