How to add missing property to AdminSDHolder

In order to do this I had to use the Active Directory Schema MMC.

Once open, navigate in to Classes and then right-click container. Choose, properties.

Under the Attributes tab, Add the missing attribute/property and apply.

Close and re-open Active Directory Users and Computers, and the AdminSDHolder object will now have the new attribute. After this, I was able to delegate permissions to write this property then allow the SD Propagator task to update all protected accounts to solve my issue.

After applying the schema change, MMC gave me an error and crashed. But, the new attribute was present as expected when I went back in to the schema MMC.