Log into account.microsoft.com/devices/recoverykey — make sure you're using every Microsoft account the device may have ever been signed into, not just the current one
Check if a different Microsoft account (an old one, a work one) was used when BitLocker first activated.
Ask your IT admin to check Entra ID → Devices → [Device] → BitLocker Keys — not just the device list,
If the Recovery Key ID doesn’t match anything you can access, and you’ve checked all accounts and backups, then realistically the data is unrecoverable.