BitLocker Drive Encryption is the technology in Windows 10 which can encrypt your hard disk drive and keep your data safe. It will usually require you to enter a pin/usb key/certificate to allow access to the encrypted hard disk drive.
Your Windows administrators are able to manage many of the settings in Active Directory, which helps in getting consistent settings across all end user computers. If you try and turn on BitLocker and you get the following error read on how to fix it.
The most likely scenario is that you have logged onto the computer with a local computer account rather than your windows domain account. Try logging in with you domain account and enabling BitLocker.