Occasionally you may encounter a computer that boots into recovery mode and asks for the 48 digit recovery key every time it is rebooted.  Usually this indicates that there has been either a change in the hardware (another hard drive added) or a change in the BIOS settings (TPM chip was turned off) on that computer.  One quick test to see if the TPM settings were changed in the BIOS is to go into the Control Panel on the system and open BitLocker Drive Encryption.

In the BitLocker Drive Encryption window click Suspend Protection.

In the BitLocker Drive Encryption window click Yes.

In the BitLocker Drive Encryption window click Resume Protection.

If you receive an error message like this one:

That most likely means that the TPM chip is turned off in the BIOS.  Reboot the computer, go into the system Setup and enable the TPM chip.

If after this the problem persists please contact the ITS Help Desk.