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This is by design. System Center 2012 Virtual Machine Manager was never intended to manage itself in highly available mode as a cluster host.
To work around this situation, create a cluster using virtual machines within a Hyper-V cluster and install Highly Available Virtual Machine Manager(HAVMM) in them. Once this is done, add the Hyper-V cluster in which these virtual machines are running into the HAVMM.
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.