diff --git a/src/layouts/customer-details/customer-details.vue b/src/layouts/customer-details/customer-details.vue
index 8f6b4048f..4ee30eb66 100644
--- a/src/layouts/customer-details/customer-details.vue
+++ b/src/layouts/customer-details/customer-details.vue
@@ -27,7 +27,9 @@
                 class="mb-4"
                 cmsWidgetName="phoneNumberQuestionWidget"
                 v-model="phoneNumber"
-                isRequired />
+                isRequired
+                validationRules="phone-number-required"
+                 />
             <textareaQuestion
                 class="mb-4"
                 v-model="techNotes"