HI Tomáš,
Thx for Your reply,
I already contatct Avast support and also with their solution, the issue still persist.
They tell me: "I was only able to find one mobile device in your account..."
But If You see in SS attached file, I see 3 device. So I suppose something is wrong in my account!
At this point, after a week of installations, uninstallations, and synchronization attemps with no results, I suppose that my account is corrupted or compromised, and therefore as a precaution for privacy and safety, I would like to delete my account and completely uninstall Avast free from all my device.
For the moment, I think is better use only Avast PRO on my main PC, without any Avast account ...and any password
THX
Best Regards.