Hello @Dinesh G
Is the machine on prem and/or Azure AD joined? If it is, and the corresponding policies where configured and deployed correctly, the key might have been saved in one of the properties of the machine object in AD. In Azure AD you can find it sing the Azure Management Portal and / or Intune Management center
More detailed information: https://support.microsoft.com/en-us/windows/finding-your-bitlocker-recovery-key-in-windows-6b71ad27-0b89-ea08-f143-056f5ab347d6
Regards,
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Juan Sobrado