In a Dell machine, where is the Bifurcation setting?

We have a working racadm command like so:


set BIOS.SlotBifurcation.DellAutoDiscovery AutoDiscovery

We have looked through the BIOS settings, and all the settings here:

/redfish/v1/Managers/iDRAC.Embedded.1/Attributes
/redfish/v1/Managers/System.Embedded.1/Attributes
/redfish/v1/Managers/LifecycleController.Embedded.1/Attributes

And haven't found anything that seems to match it. I did find  "LCAttributes.1.AutoDiscovery": "Off", but trying to set that to "On" gave me an error about it being a read-only attribute.

Any pointers as to where to find this setting or how to set it via Redfish?

Thanks!