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Similar issues found on different vendors with different solutions please check the following
How to set the BIOS to prevent BitLocker recovery key prompts.
To resolve the issue please follow the steps below.
Enter the BIOS (F2 at boot or F12 one time boot menu at boot)
Go to System Configuration, then USB Configuration, and uncheck the following.
Disable USB Type-C or Thunderbolt 3 Boot support
Disable USB Type-C or Thunderbolt 3 (and PCIe behind TBT) Pre-boot
Set POST Behavior -> Fastboot -> Thorough
Upon doing this the system should not prompt for the BitLocker key on every boot.
Note: This is a solution for USB Type-C / Thunderbolt 3 configurations causing a BitLocker recovery prompt at boot. There are other reasons for recovery key prompts that this procedure may not resolve.
This solution should work in UEFI mode.
Systems using legacy mode can use the same steps provided in SLN305408 - BitLocker Fails to turn on or prompts for the Recovery Key after every reboot with Windows 10, UEFI, and the TPM 1.2 Firmware
upgrade the BIOS
& check the following
Open the BitLocker manager tool by either
Typing BitLocker into the start menu seach box and selecting the first result
or in the control panel, System & Security > BitLocker
Click "Suspend Protection" on your system disk
Select yes to the prompt that appears
Click "Resume Protection"
Now BitLocker will remember your updated system configuration.
use UEFI with TPM 2.0 then Bitlocker is working just fine.
all the best