How can I find servers for Primal Carnage?

I just bought Primal Carnage on the current Steam sale; the original version, not its sequel, Primal Carnage: Extinction.

It's a multi-player game. There's no single player mode; you need to join a server. But I can't find any.

The list is empty. Refreshing doesn't help, nor changing the settings.

I've searched with Google for where can I find primal carnage servers -extinction and variations thereof, and dug up some old threads on the Steam forums, including one with a proposed solution: verify the game cache, which I did, but to no avail.

What else can I do to find the servers?

Version is 1.3.0; build ID is 132188.

Addendum 2018-05-03

Well, it may be a bug. After installing it on a new machine, a list of servers showed up and I'm able to play. Upon reloading it is empty occasionally, though.

After some quick searching, it seems that Primal Carnage: Extinction is a remake, not exactly a sequel, of the original which includes both multiplayer and new single player mode.

Going to the Primal Carnage forums shows that the last post in the 1.3 version of the original was 8/27/2016. Whereas the last post in the section for PC:E was 6/16/2017. This could mean there are simply no servers to join as nobody is online.

I would request a refund from steam assuming you have under 2 hours played. Or find out if there are other small active communities still playing the game.