Windows 10: I have a problem with bitlocker error 0xc00021a

I have a problem with bitlocker error 0xc00021a

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problem with bitlocker

Hi Roeslie,

Thank you for writing to Microsoft Community Forums.

We need some more details to help you find the solution to your problem.

• Which edition of Windows 10 is installed on your surface machine?
  
• Did you notice any changes on the computer recently?
  
• When you say, you have a problem with your Surface machine about BitLocker key, do you mean that the surface machine asks you to enter the BitLocker key to allow you to sign into Windows?
  
• Does the other computer ask you to enter the BitLocker key to allow you to access the files saved on it?
  

If you are being asked to enter a BitLocker key to sign into your surface machine and you don’t remember your BitLocker key, you can follow the instructions given in the link below to find the BitLocker recovery key.

Find my BitLocker recovery key

Please get back to us with the information requested above, so that we can suggest the appropriate troubleshooting steps.

Peer Samie

Microsoft Community-Moderator

 

Need to turn off Bitlocker to install Windows 10

Hi,

We suggest doing the following steps again to resolve the issue. To complete the procedure, make sure that you have the following information:

• You must be able to provide administrative credentials.
• The drive must be BitLocker-protected.

To suspend BitLocker Drive Encryption on an operating system drive, please follow the steps below:

• Click Start, click Control Panel, click
  System and Security, and then click BitLocker Drive Encryption.
• Click Suspend Protection for the operating system drive.
• A message is displayed, informing you that your data will not be protected while BitLocker is suspended and asking if you want to suspend BitLocker Drive Encryption.
  
• Click Yes to continue and suspend BitLocker on the drive.

Let us know how it goes.

 

Bitlocker

Hello Nandana,

To enable BitLocker on your computer, you follow the steps below:

• Sign in to your Windows account with an administrator access.
• Press the Windows key.
• Type and enter BitLocker.
• Click Turn on BitLocker.
• If the system is asking to sing in to administrator access, please do so.

For additional information about BitLocker, we suggest that you check the frequently ask question on this
link. The link provided applies to Windows 8.1 to higher version.

If you have other concerns, don't hesitate to reach us.