Tuas Sg ICA has a manual lane for EP holders. If you have not got your EP yet, i.e., only IPA, you got to queue the normal manual lanes.

The auto passport lanes only for Sg citizens, SPRs and long term pass holders including EP. But for pass holders, one has to register first to use the system. But as a new EP holder, once you register at MoM, where your finger prints will be collected and will normally be linked to the Sg e-IACS system. It may take a couple of weeks after registering at MoM that the details is passed on to the Sg ICA.

Read here for more info: Sg Immigration e-IACS