Hello,
I tried to do it but the situation is the following:
I receive only one mail around Jun 4, 2019 but there wasn't any 'Restore' button in the mail only a 'VERIFY EMAIL'. But that link is expired.
When I try to configure Syncronization & Back-up in the Android app and I get that screen where I chose 'DON'T HAVE ANOTHER SYNCED DEVICE?' option.
After that I should enter my previous Avast Account password to sync but I can't remember to that pw.
So I can't continue with password syncing.
So sad.