Hi,
The recovery key is automatically saved to your Microsoft Account when the device is encrypted (if a Microsoft account was signed in when using your PC), and can be retrieved from https://account.microsoft.com/devices/recoverykey .
Please refer to this instruction: https://support.microsoft.com/en-us/windows/finding-your-bitlocker-recovery-key-in-windows-10-6b71ad27-0b89-ea08-f143-056f5ab347d6
Best regards.
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