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Did they use to exist there? Was there any presence of these civilizations? Or were they non existent?

The answer is "maybe"
There is mention of some ancient kingdoms, but not names per se.
This is basically in keeping with the game motif of mystery and intrigue.
Thus it is possible that this Earth had its own versions of Atlantis, or Lemuria, or Nazca, or the like. Or it might not have. What we do know is that the timeline for the Nightlords is such that there had to have been some ahistorical civilization(s)... but we don't know what.

I haven't read my NB books but wasn't there a lost civilization in the Darklands? Did the books ever say who they were?

Nope, just that they existed and made a metric crap ton of Artifacts.
The people exploring it believe (on no firm evidence as far as I know) that it is Atlantis... but that is just their speculation. Apparently they have an entire ruined city full of magic items... and not one darn thing written down anywhere for them to do a language check with

iirc, a lot of the story we do know about nightbane suggests that a lot of it comes from ancient sumeria =S

but yeah, there are definitely other ancient groups hinted at. i'm not convinced nightbane has a very atlantis feeling to it, personally... most likely those places were just linked via (semi)permanent portals or something, leading to the stories about them, but they don't really seem to fit in with the rest of the story of the setting imo.

of course, such a thing as portals that allow any sort of meaningful cultural exchange would suggest that perhaps long ago the mirrorwall wasn't there...

Of course it's Atlantis! It's always Atlantis!

Them darn True Atlanteans get into *everything!*

If you want it to be Atlantis, you now have a perfect tie-in to all the Atlantean/Megaverse/Magic/Psi/Stuff you want to poach.

Again it has been a long time since I've read NB but if memory serves aren't the Nightlords older than Atlantis? Didn't they leave for the darklands before the dominance of Atlantis and it's disappearance?

We can't assume that Atlantis in the style of Rifts Earth ever existed on Nightbane Earth.

I think that is the point of the OP.

Accidentally hit submit before I finished.

Like I said I couldn't remember if they were in there but there are lost civilizations but not sure who they are.

Not explicitly. the existance of magically powerful civilizations pre-dating the Nightlords (and thus presumably participating in the big war that sealed them into the Nightlands) was stated, but it's deliberately vauge on what these kingdoms were, or where they were located.

I think i read once in the books that kind of implied the NIGHTLORDS were their homeworld's version of the True Atlanteans, but honestly can't remember which one. Need to check that out one of those days....