Yes - removed old device from my.avast. Followed uninstall instructions from the FAQ.
After I hit Go Premium I select I already have a license and a message indicates that by selecting YES a new license will be generated. However, right now I still can’t use the Premium features which I had on the old phone. If I try to enter my Licence code I see a message advising that the number has already been used. Can’t see where to go from here. My.Avast shows that I have the Premium Suite and shows the validity date. So, in Anti Theft the Free features are working but not the Premium.