diff --git a/helmfile/apps/nubus/values-nubus.yaml.gotmpl b/helmfile/apps/nubus/values-nubus.yaml.gotmpl
index fcbd6dfc..836006f1 100644
--- a/helmfile/apps/nubus/values-nubus.yaml.gotmpl
+++ b/helmfile/apps/nubus/values-nubus.yaml.gotmpl
@@ -53,6 +53,8 @@ global:
   configUcr:
     directory:
       manager:
+        mail-address:
+          uniqueness: "True"
         rest:
           authorized-groups:
             domain-admins: __DELETE_KEY__
@@ -67,9 +69,9 @@ global:
                   description:
                     syntax: "TextArea"
                   firstname:
-                    required: "true"
+                    required: "True"
                   mailPrimaryAddress:
-                    required: "true"
+                    required: "True"
                   username:
                     syntax: "uid"
                 search: