Dell Command Configure TPM Clear

I am trying to use the Dell Command Configure (Version 4.1) in a backup & wipe SCCM Task sequence. What this would be used for is to backup the hard drive to a NAS using a script, then use the Dell Command Configure to clear the TPM chip of its owner keys and then clear the BIOS password and reset the BIOS to defaults. So I can replace the computer and dispose of the old one. 

The line I am trying to do to clear the TPM keys are:

cctk.exe --TpmClear=Enabled --valsetuppwd=password

When I run this line either in a Task Sequence or manually through command prompt I receive the following error:

Attempt to write read-only parameter 'TpmClear'

All of my Dell models that have TPM chips have BitLocker enabled so I want to clear the TPM keys before disposal. I have tried this same command on the follow models with the latest firmware version:

OptiPlex 5050, 5040, 7010, 7020

Is there something I am doing wrong? All the documentation says is that I need a BIOS password in order to use this command. All help would be appreciated. Thank You.