MacPro% env|grep ALLOW
NIXPKGS_ALLOW_UNFREE=1

MacPro% nix --extra-experimental-features nix-command profile upgrade '.*' --verbose

       error: Package ‘1password-cli-2.22.0’ in /nix/store/mrckm9b3v6wg2fljdp3z4pja1sz07g3z-source/pkgs/applications/misc/1password/default.nix:71 has an unfree license (‘unfree’), refusing to evaluate.

       a) To temporarily allow unfree packages, you can use an environment variable
          for a single invocation of the nix tools.

            $ export NIXPKGS_ALLOW_UNFREE=1

          Note: When using `nix shell`, `nix build`, `nix develop`, etc with a flake,
                then pass `--impure` in order to allow use of environment variables.

       b) For `nixos-rebuild` you can set
         { nixpkgs.config.allowUnfree = true; }
       in configuration.nix to override this.

       Alternatively you can configure a predicate to allow specific packages:
         { nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
             "1password-cli"
           ];
         }

       c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
         { allowUnfree = true; }
       to ~/.config/nixpkgs/config.nix.