BitLocker key protector management help

Seeking BitLocker help:

Win10 machine with TPM.
OS drive was successfully encrypted with "TPM & PIN" additional key protection.
Now I'm hoping to drop back to "just TPM" with no additional PIN protection without having to decrypt and re-encrypt. (note: the reason is so that updates will reboot back to windows login and leave this base station machine accessible by Remote (RDP) but the reason is not what I want to discuss)

I haven't found how to do it yet and don't know whether to concentrate on the "manage-bde" commands or gpupdate or both to find the answer. None of the local bitlocker policies are enabled (but the machine is in an AD domain.) If I try the following:
manage-bde -protectors -delete C: -Type TPMAndPIN
(within an admin cmd prompt) I get:
"ERROR: An error occurred while deleting the key protector.
Group Policy settings require the use of a PIN at startup. Please choose this Bitlocker startup option."

Is there a way I can check what the domain admin is requiring? I forget how to check the broader group policies on Win10.
Thanks! tinten10

Thanks Kari, Yes, I'm trying to do that, it just takes time in a large organization. Meanwhile, if they are -not- ruling that my users have to have a PIN on top of the TPN I'm trying to figure out if I've found the right way to remove the PIN I set up without having to decrypt/re-encrypt....

~tinten10~