Hello there,
Do you see an option to send the security code to your phone?
Open a web browser on another device and Sign in to your Microsoft account to find your recovery key. This is the most likely place to find your recovery key.
You can just go to https://account.microsoft.com/devices/recoverykey.
If you are unable to locate the BitLocker recovery key and can't revert any configuration change that might have caused it to be required, you'll need to reset your device using one of the Windows recovery options.
Where to look for your BitLocker recovery key https://support.microsoft.com/en-us/windows/where-to-look-for-your-bitlocker-recovery-key-fd2b3501-a4b9-61e9-f5e6-2a545ad77b3e
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