@ DavidR
In every version of Avast you can log into Avast through the PC Application. This gives you some additional access to see what other items are on your account, report to your control avast global control panel and see your licenses.
I'm pinging this thread because I don't see the option in v17.1 either. This is the first version of Avast this wasn't extremely obvious where to login. It's fairly frustrating.