Event 812: BitLocker cannot use Secure Boot for integrity because the UEFI variable 'SecureBoot' could not be read.

First Step

Check the current status.

Open the Command Prompt and run the following command

Manage-bde -protectors -get c:

*we can change the drive letter as per our requirement.

Secondly

Run the following command one after one as per the order.

The Fix:

manage-bde -protectors c: -delete -t tpm

manage-bde -protectors c: -add -tpm

Finally, check the status after completing the above steps.

run the command stated in the first step and Validate that 7,11 are the PCR used.

Event 812: BitLocker cannot use Secure Boot for integrity because the UEFI variable ‘SecureBoot’ could not be read.