UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0

Steps to reproduce the problem:
1. set the policy on a non domain joined machine
2. load an autoplay page (e.g. https://videojs.github.io/autoplay-tests/plain/attr/autoplay.html)

What is the expected behavior?
The doc for the policy (http://dev.chromium.org/administrators/policy-list-3#AutoplayAllowed)

does not state that "This policy is not available on Windows instances that are not joined to a Microsoft® Active Directory® domain."

so then it should be available and autoplay should be disabled

What went wrong?
autoplay is not disabled

Did this work before? N/A 

Chrome version: 69.0.3497.81  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: