Secondary virtual machine cannot be powered on as there are no compatible hosts that can accommodate it.
No compatible hosts that can accommodate the secondary virtual machine.
In this case the primary remains powered on in live mode, but fault tolerance is not established. VMware FT requires that Hardware Virtualization (HV) be turned on in the BIOS.
See the vSphere Availability Guide for more information.
Refer to the VMware Online Documentation for more information.