Hello,
In this case, it is recommended that you use a different device to sign in to your Microsoft account to find the BitLocker recovery key.
More details please refer to this link:
https://support.microsoft.com/en-us/windows/finding-your-bitlocker-recovery-key-in-windows-6b71ad27-0b89-ea08-f143-056f5ab347d6
Best Regards,
Hania Lian
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