The way the S3 works is that on the "HF 2" and the "VHF" connectors, BiasTee voltage is available (but by default turned off) and it needs to be enabled in software.
The "HF 1" connector has no capability to provide BiasTee, so it does not have any marking on the back panel.
SDR console has options to enable BiasTee on the HF2 and VHF connectors independently.
Thanks.