1. Plug in the Laptop's power adapter to the USB-C Power Delivery port.
2. Verify if your system supports PD charging over USB-C and also identify which port has this functionality if multiple USB-C ports USB-C/Thunderbolt 3 may not support charging from universal docks and may only charge from approved chargers and devices from the system manufacturer.
3. Probably your laptop's rated wattage exceeds 100W. The PD charging port of the docking station support Max 100W power passing-through.