Q: I purchased units with TPM 2.0 but use a custom Windows 7 32-bit image. Will we be able to utilize bitlocker?

A: The answer is yes, but you will need to downgrade to TPM 1.2

If you do not change to TPM 1.2 you will get an error like below when trying to bitlocker

Please see TPM downgrade to 1.2 FAQ for details