I have installed Sierra Beta in a virtual machine running under El Capitan.

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Virtualbox Apple Os

It is mostly working except I don't seem to be able to use Apple services such as Messages or downloading updates from the App Store.
When I enter my AppleID and password in Messages, nothing happens.

Virtualbox Applekeystore Operation Failed

I am able to log into the App Store but downloads of available (Sierra) updates are not working.
I know its not specific to Sierra - I had the same problem when I first built the machine as El Capitan.
Is it possible that there is something wrong with the hardware identification as seen by Apple? The physical hardware is Mac-Mini (late 2012) and running El Capitan (10.11.6), with VirtualBox 5.1.2
Bryan