CCTK and enabling TPM issue

I’m looking to enable the TPM on all our DELL models using a SCCM task sequence. I’ve set up a test TS and tried this on both Optiplex 7010 and 790 (with up to date BIOS)  but can’t get the thing to work. Here’s the steps I’ve taken, would love to know where I’m going wrong!

 Have packaged and tested with versions 2.2 and 4 of the CCTK files and created a test TS with the following steps… 

Boot into WinPE

 Install the HAPI driver  (this works ok)

 Set Password:   Command line step: cctk.cmd --setuppwd=MyPassword   (this step works)

 Enable TPM:    Command line step:  cctk.cmd -–tpm=on –valsetuppwd=MyPassword  (TS fails here)

 The smsts.log says the syntax is wrong but it’s the same as the guides etc. I’ve tried all sorts of variations but nothing working yet.

 Grateful for any help