Insp 15 requesting bitlocker key after memory swap

I operate a computer services and repair shop.  A customer brought a computer which had an issue with the memory running at 100% in Win10.  As a routine, I ran our hardware test disk and found that one of the memory modules had failed one of the memory tests.  For troubleshooting purposes, I swapped out both memory modules and retested.  They both passed all memory tests now.  When I went to boot into Windows, the Bitlocker recovery process had interrupted the booting.  It is requesting a recovery key.  The customer has no knowledge of enabling Bitlocker.  The computer is using a Microsoft account as login.  So I logged in using the account to see if the Bitlocker key would be in the online portal, but it is not.  I contacted MS support and they claim that Bitlocker was enabled by the computer's manufacturer.  Can anyone offer any suggestions for getting past this Bitlocker recovery process or for getting a recovery key?