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I wish I could share good news, but the truth is no one can get you the bitlocker key, including Microsoft staff/support. https://support.microsoft.com/windows/find-your-bitlocker-recovery-key-6b71ad27-0b89-ea08-f143-056f5ab347d6 The link here says:"Important: Microsoft Support doesn't have the ability to retrieve, provide, or recreate a lost BitLocker recovery key."
Since this is a school managed device, check this link instead: https://aka.ms/aadrecoverykey sign in with your work/school email credential in that case.
If it is not stored there, ask your school IT department. Some organization might opt to store the keys via MDM in the backend. In that case, only they can access.