When built on a planet, the warp gate gives you menu and page to find info, activate warp gate, and see cool down https://prnt.sc/pziw5f . However when built on the PPS there is no menu or page to activate https://prnt.sc/pzix86 , you have to go thru the building info to activate on PPS https://prnt.sc/pzivlq . I do not know if the warp gate is supposed to be able to be used on PPS or if there is just no menu and page for it on them.