too lazy to think of a message, so enjoy this pointless text. Good luck future me...

clanServices/customer-portal/default.nix

@@ -1,4 +1,4 @@
-{ ... }:
+{ self, ... }:
 let
   inherit (builtins) readFile;
 in
@@ -26,6 +26,8 @@ in
 
     perInstance = { instanceName, settings, machine, roles, ... }: {
       nixosModule = { config, pkgs, ... }: {
+        imports = [ self.inputs.amarth-customer-portal.nixosModules.default ];
+
         services.amarth-customer-portal = {
           enable = true;
         };

clanServices/customer-portal/flake-module.nix

@@ -1,13 +1,15 @@
-{ ... }:
+{ self, lib, ... }:
 let
-  module = ./default.nix;
+  module = lib.modules.importApply ./default.nix { inherit self; };
 in
 {
   clan.modules.customer-portal = module;
 
   perSystem = { ... }: {
     clan.nixosTests.customer-portal = {
-      imports = [ ./tests/vm/default.nix ];
+      imports = [
+        ./tests/vm/default.nix
+      ];
 
       clan.modules."@amarth/customer-portal" = module;
     };