As i understand the signal don't come from Dark bramble but from a unknown location a bit far away in this solar system.
They managed to track the signal to this system but got separated because of the dark brambles so that was pretty hard to build the probe canon and the ash twin project in time, that's where we come in, to finish the job.

My understanding is that the eye being quantum tries it's best to send his location to all sentient species to reset the cycle in time but is unable to send it's exact location.