I have a surface pro 3 with windows 10. My bitlocker has had this weird yellow triangle on my local drive implying it wasn't working properly, so I decrypted the drive. I then proceeded to go to bitlocker to try and re-encrypt it and I get this message. I have disabled Cortana and a bunch of the privacy stuff.

'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.'

Run this on CMD as admin:

powershell.exe -command "New-Item -Path HKLM:\SOFTWARE\Policies\Microsoft -Name FVE; Set-ItemProperty -Path HKLM:\SOFTWARE\Policies\Microsoft\FVE -Name OSEnablePrebootInputProtectorsOnSlates -Value 1 -Type DWord -Force"

This will allow you to enable bitlocker again.