BDEPin=1234 variable in CS.ini does not prefill TPM with Pin value in MDT 2012

Hi All

I am currently using MDT 2012 for creating our images. 
When i use BDEPin = 1234 in CustomSettings.ini, it does not prefil the TPM and Pin value in the Bitlocker wizard. We have to manually enter the value.
It works fine in MDT 2010.

Any idea?