I FINALLY got a dagger!
There were 5 monoliths, and the portal was within spitting distance of one of them. 
Now I’ve got the address, and I’ve loaded up my original save. When I get back from my next client I’ll get to a portal and zip over. Fingers crossed the Atlas station is in the same place. 
Update 1: Back in my original save file, I went to a portal, entered the address, and off I went! I forgot that the Galaxy map doesn’t work until you get back to the other side.
So I recorded the system name, planet name, and headed for the space station. I jumped in and out of my ship a couple times to make sure the auto save, saved. I tried to access the teleporter while I was there; it’s also a no-go. So I opened up my Discoveries to make sure the system was registered there. It was, and I set a Waypoint on it.
I headed back through the portal and ran to the space station to see if I could use the teleporter to get there, now that I’d been. The Space Station at the other end isn’t showing up in the list.
I jumped in my ship and out I went. I checked my Galaxy map and it shows the path to the Waypoint, but it’s going to be a long long long way there. Le sigh.