The selected computer %ComputerName; cannot be a host because VMM no longer supports 32-bit hosts. Remove the computer %ComputerName; ...

The selected computer %ComputerName; cannot be a host because VMM no longer supports 32-bit hosts. Remove the computer %ComputerName; from VMM management. Select a computer that is running a supported 64-bit Windows Server operating system, and then try the operation again.