In windows 8 you will need to run following command in powershell.
$tpm
= get-wmiobject
-class Win32_Tpm
-namespace root\cimv2\security\microsofttpm
$tpm.SetPhysicalPresenceRequest(16)
$tpm.SetPhysicalPresenceRequest(18)
$tpm.DisableAutoprovisioning()
$tpm.SetPhysicalPresenceRequest(22)
16 and 18 I added as precaution to set provision that you do not need to be present to set or to clear the TPM.
After these commands MBAM has been able to take ownership on windows 8 of TPM and started encryption.
you could just use
$tpm
= get-wmiobject
-class Win32_Tpm
-namespace root\cimv2\security\microsofttpm
$tpm.DisableAutoprovisioning()
IT support