Upload domain joined computer bitlocker key to Active Directory

To upload already encrypted drive bitlocker key to AD, you can use this PowerShell oneliner. Remember to use "run as administrator"

Backup-BitLockerKeyProtector c: ((Get-BitLockerVolume c:).KeyProtector | ? KeyProtectorType -eq RecoveryPassword).KeyProtectorId

If you already have the information in AD, then it doesn't hurt, it will not create any duplicates in AD