Bitlocker Encryption still running at 128kb instead of the required 256kb.

Hi

Hopefully I have put this in the correct forum 🙂

We use SCCM and have created a Windows 10 deployment which should set bitlocker encryption to 256KB but instead it's setting it to 128KB. The step to change the encryption is set in the build sequence. 

Its not Group policy that is affecting it as its occuring well before then and at build. 

Does anyone have any suggestions what it could be?

I will post this on the Microsoft Endpoint Manager forum in case its best answered there. 

Many Thanks