When you try suspend BitLocker via Task Sequence step it fails. On checking smsts.log you find out the below errors
Even if you try to run manage-bde -protectors -disable c: in an elevated command prompt it fails with “Invalid Namespace” error. Cause This problem occurs if the Bitlocker WMI class (win32_encryptablevolume) is not registered or missing registration. Resolution To resolve this problem, you have to re-register the BitLocker WMI (win32_encryptablevolume) class.
Open an elevated command prompt and type the following command: mofcomp.exe c:\windows\system32\wbem\win32_encryptablevolume.mof If the file successfully compiles you will receive the following message: Microsoft (R) MOF Compiler Version 6.1.7600.16385 Copyright (c) Microsoft Corp. 1997-2006. All rights reserved. Parsing MOF file: win32_encryptablevolume.mof MOF file has been successfully parsed Storing data in the repository… Done!
Now re-run the task sequence and it should successfully suspend and enable BitLocker.