evdevremapper systemd service on nixos

config.yaml

devices:

- input_name: 'AT Translated Set 2 keyboard'
  output_name: 'AT Translated Set 2 keyboard remapped'
  remappings:
    # Fix key right of left shift
    KEY_102ND:
    - KEY_GRAVE

# more omitted as it doesn't change the issue

configuration.nix

  systemd.user.services."keyboard-remapping" = {
    enable = true;
    path = [pkgs.evdevremapkeys];
    wantedBy = [ "default.target" ];
    serviceConfig = {
      WorkingDirectory = "/tmp";
      ExecStart = "${pkgs.evdevremapkeys}/bin/evdevremapkeys -f /etc/nixos/keyboard/config.yaml";
      Restart = "always";
      PrivateTmp = true;
      NoNewPrivileges = true;
    };
  };

systemd log

Apr 03 02:37:40 nixos evdevremapkeys[1119]:   File "/nix/store/z3m2k16zbhj18kh3rmzyh977j1i20da3-python3.8-evdevremapkeys-0.1.0/lib/python3.8/site-packages/evdevremapkeys/evdevremapkeys.py", line 262, in register_device
Apr 03 02:37:40 nixos evdevremapkeys[1119]:     raise NameError("Can't find input device")
Apr 03 02:37:40 nixos evdevremapkeys[1119]: NameError: Can't find input device

Running the same in a shell (without systemd) works