I don’t have 24V but 12V, also there is no Victron 12V - 56V DC-DC converter but there is nothing wrong with the hardware nor the cabling itself. Also you only need the higher Watt output for the heating of the dish and that is not required over here, also the inverter I have is 48,3V 3A and that is enough.
And you do have to Swap the cable order on the outgoing data side with this passive POE like the one I use if you use yaosheng you overcome the need of swapping as this is done inside of the POE so you overcome the issue with the proprietary Starlink hardware UTP connectors.
The issue is/was that the Peplink does not accept the swapped cable and starts port flapping, while other routers do work Netgear/TP-Link/my cheap RV router.