@Vicki Payne
Hi,
Did you remember to enable BitLocker?
If not, it seems like BitLocker was enabled automatically based on how the Windows 10 image was configured.
Based on my research, some systems ship with BitLocker "prepped", and if you choose to link your Windows logon account to a Microsoft account, BitLocker is automatically enabled because the Recovery Key is backed up to the Microsoft account you linked with.
The following information may help you locate your recovery key:
https://support.microsoft.com/en-us/windows/finding-your-bitlocker-recovery-key-in-windows-10-6b71ad27-0b89-ea08-f143-056f5ab347d6
Hope above information can help you.
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