Upd: MP leaderboard is up again !

Upd.: I fixed it, should be working now!

Folks, we have some unexpected issues with the Multiplayer Leaderboard!

Good news — I fixed it already locally on my game build.
Bad news — you have to wait for the next game/patch release to get the working one. Until then, unfortunately, MP Leaderboard will be inaccessible. Sorry about that.