Also, the whole point of the TPM (when I looked it up) was to not tell anyone, including Microsoft your decryption key. It’s so the user has ten chances to enter a short PIN or password and then it unlocks the device. That way not even Microsoft or the police can unlock the device without a tunnelling electron microscope with which to crack the TPM.
That way, you see, getting into a device is expensive and something law enforcement would not be tempted to do without an ironclad warrant and maybe a national security reason.
That Microsoft can ask TPMs to break their T makes them not T-worthy enough to be called a TPM. More like a Microsoft Obedience Chip.