HP scanner nixos 19.03

I am trying to use my scanner that is a wifi one. It is a HP scanner. I have been following: Scanners - NixOS Wiki so I have:

sane = {
  enable = true;
  extraBackends = [ pkgs.hplipWithPlugin ];
  extraConfig."hpaio" = ''

I have tried rebooting and running scanimage -L as normal and root users. Still no scanner. Not sure what to do from here.

did you do any sort of ‘nixos-rebuild’?
If no, the new configuration in your nix file is not in place, even after rebooting…

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