Issue
The following error prevented me enabling BitLocker encryption on a new Windows 10 Enterprise laptop.
“This PC doesn’t support entering a BitLocker recovery password during startup. Ask your administrator to configure Windows Recovery Environment so that you can use BitLocker.”
Investigation & Fix
Windows Recovery Environment (Windows RE) isn’t installed (confirmed with reagentc.exe /info).
From an elevated Command Prompt, run the following command to enable Windows RE.
reagentc.exe /enable
Sorted! BitLocker can now be enabled.