
To unlock by using a SID protector, use Manage-bde:

System administrators can configure which options are available for users, as well as password complexity and minimum length requirements. After you've started encryption, the drive can also be automatically unlocked on a specific computer for a specific user account. You can unlock removable data drives by using a password, a smart card, or you can configure a SID protector to unlock a drive by using your domain credentials.

How can I authenticate or unlock my removable data drive?
