type “gpedit.msc” into the Run dialog box, and press Enter.
Navigate to Local Computer Policy > Computer Configuration > Administrative Templates > Windows Components > BitLocker Drive Encryption > Operating System Drives in the left pane.
Double-click the “Require additional authentication at startup” option in the right pane.
Select “Enabled” at the top of the window, and ensure the “Allow BitLocker without a compatible TPM
Close the window
There is no need to reboot. You can encrypt your drive now.
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