How to fix error The Group Policy settings for BitLocker startup options are in conflict and cannot be applied

ERROR: An error occurred (code 0x8031005b): The Group Policy settings for BitLocker startup options are in conflict and cannot be applied. Contact your system administrator for more information.

I got this error when I attempted to encrypt a virtual hard drive (.vhd) that I created as a backup disk.

Platform: Microsoft Windows [Version 10.0.19043.1348]

FIX:

• Open Policy settings:

gpedit.msc

• Go to “Local Computer Policy > Administrative Templates > Windows Components > BitLocker Drive Encryption > Operating System Drives”
• Select the following Item: “Require additional authentication at startup”

Local Group Policy Editor

• Change the following:
• Change it to “Enabled”
• Uncheck “Allow BitLocker without a compatible TPM”
• Change “Configure TPM startup” to “Do not allow TPM”
• Change “Configure TPM startup PIN” to “Require startup PIN with TPM”
• Change “Configure TPM startup key” to “Do not allow startup key with TPM”
• Change “Configure TPM startup key and PIN” to “Do not allow startup key and PIN with TPM”
• Click “Apply” and “OK”

Require additional authentication at startup

• Open regedit
• Find key: Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE
• Export for backup and delete it.
• Open Terminal and execute:

gpupdate /force /target:computer

• To encrypt the drive F:

manage-bde -on f: -rp

Result should be something like:

BitLocker Drive Encryption: Configuration Tool version 10.0.19041
Copyright © 2013 Microsoft Corporation. All rights reserved.

Volume F:
[Data Volume]

Hope it helps!