Bitlocker auto enabled on drive

The Bitlocker encryption was enabled on my partition device E: on its own post a System Restore. Thus, I don't know where the key is. I am using a local account with no Windows account signed in. This is a personal computer; the keys are not saved in the Microsoft account. Only the E: drive is locked, C: drive is open.

Before BitLocker got turned on mysteriously, I had performed a System Restore.

Below is the output for E: drive

Could anyone please guide me on how to retrieve the key ? I have already tried all the steps in the https://support.microsoft.com/en-us/windows/finding-your-bitlocker-recovery-key-in-windows-6b71ad27-0b89-ea08-f143-056f5ab347d6