Least Used Unavailable with VDSL Module?

I decided to add the FlexModule MINI VDSL module to “simply” my installation, however it seems to support fewer features than when I used the carrier supplied modem in bridging mode. Specifically, I can no longer balance between starlink and DSL with the least used outbound policy as the VSDL module isn’t available for selection.

Is this a configuration error somewhere in my setup, or a limitation of the least used policy feature?