If I remember correctly, last year at Ignite the Exchange team mentioned that Set-DatabaseAvailabilityGroup -AutoDagBitlockerEnabled that was implemented in CU2 did not actually work (yet). I have not seen anything public to that effect, acknowledging the problem or that it has been fixed. Can the team please point me in the right direction for documentation or speak to this?
https://blogs.technet.microsoft.com/exchange/2016/06/21/released-june-2016-quarterly-exchange-updates/
AutoReseed support for BitLocker
Beginning with Exchange 2013 CU13 and Exchange 2016 CU2, the Disk Reclaimer function within AutoReseed supports BitLocker. By default, this feature is disabled. For more information on how to enable this functionality, please see Enabling BitLocker on Exchange Servers.