usually the storyline missions take place on the starting planet u choose in the beginning. scroll back a bit in the story for a playfield change if it doesn’t show hud markers when reactivating the mission on the starter planet.
I checked, and unfortunately the coordinates aren’t visible to us either, as the position is found automatically by the game.
But it’s just a Communications Station you have to find, and as Bob said, they’re usually on the starter planets.
If you’re lucky, you’ll be able to see the POI in your ingame registry, if you already discovered it.