windows - Default TPM Owner Authorization Key

Question

I am wondering what the default TPM Owner Authorization key is to be able to clear the TPM via PowerShell.

Clear-Tpm -OwnerAuthorization "?"

I am able to clear it in Windows via tpm.msc without a password. However, I need to be able to do this with a script to enable Bitlocker. When I try Clear-Tpm without the OwnerAuthorization parameter, it says an owner authorization value is required to be supplied. Is there a default value for this? Or is it stored somewhere? It just doesn't make sense that I need a password for the PowerShell command to clear it, but not for the GUI.