diff --git a/js/apps/admin-ui/cypress/e2e/users_test.spec.ts b/js/apps/admin-ui/cypress/e2e/users_test.spec.ts
index 28cd391dd1..3f019a2af9 100644
--- a/js/apps/admin-ui/cypress/e2e/users_test.spec.ts
+++ b/js/apps/admin-ui/cypress/e2e/users_test.spec.ts
@@ -163,6 +163,20 @@ describe("User creation", () => {
 
     masthead.checkNotificationMessage("The user has been saved");
 
+    attributesTab
+      .addAttribute("LDAP_ID", "value_test")
+      .addAttribute("LDAP_ID", "another_value_test")
+      .addAttribute("c", "d")
+      .save();
+
+    masthead.checkNotificationMessage("The user has not been saved: ");
+
+    cy.get(".pf-c-helper-text__item-text")
+      .filter(':contains("Update of read-only attribute rejected")')
+      .should("have.length", 2);
+
+    cy.reload();
+
     userDetailsPage.goToDetailsTab();
     attributesTab
       .goToAttributesTab()
diff --git a/js/apps/admin-ui/cypress/support/pages/admin-ui/manage/AttributesTab.ts b/js/apps/admin-ui/cypress/support/pages/admin-ui/manage/AttributesTab.ts
index 9f9f539eb5..9f9956f4dc 100644
--- a/js/apps/admin-ui/cypress/support/pages/admin-ui/manage/AttributesTab.ts
+++ b/js/apps/admin-ui/cypress/support/pages/admin-ui/manage/AttributesTab.ts
@@ -44,7 +44,7 @@ export default class AttributesTab {
     cy.findByTestId(this.#keyInput).should((exist ? "" : "not.") + "exist");
 
     if (exist) {
-      cy.findAllByTestId(this.#keyInput).invoke("val").should("eq", "key_test");
+      cy.findAllByTestId(this.#keyInput).invoke("val").should("eq", key);
     }
 
     return this;
diff --git a/js/apps/admin-ui/src/components/key-value-form/KeyValueInput.tsx b/js/apps/admin-ui/src/components/key-value-form/KeyValueInput.tsx
index d829d2b618..a1c4d9ca00 100644
--- a/js/apps/admin-ui/src/components/key-value-form/KeyValueInput.tsx
+++ b/js/apps/admin-ui/src/components/key-value-form/KeyValueInput.tsx
@@ -73,9 +73,10 @@ export const KeyValueInput = ({
           <span className="pf-c-form__label-text">{t("value")}</span>
         </GridItem>
         {fields.map((attribute, index) => {
-          const keyError = !!(errors as any)[name]?.[index]?.key;
-          const valueError = !!(errors as any)[name]?.[index]?.value;
-
+          const error = (errors as any)[name]?.[index];
+          const keyError = !!error?.key;
+          const valueErrorPresent = !!error?.value || !!error?.message;
+          const valueError = error?.message || t("valueError");
           return (
             <Fragment key={attribute.id}>
               <GridItem span={5}>
@@ -118,15 +119,15 @@ export const KeyValueInput = ({
                     aria-label={t("value")}
                     data-testid={`${name}-value`}
                     {...register(`${name}.${index}.value`, { required: true })}
-                    validated={valueError ? "error" : "default"}
+                    validated={valueErrorPresent ? "error" : "default"}
                     isRequired
                     isDisabled={isDisabled}
                   />
                 )}
-                {valueError && (
+                {valueErrorPresent && (
                   <HelperText>
                     <HelperTextItem variant="error">
-                      {t("valueError")}
+                      {valueError}
                     </HelperTextItem>
                   </HelperText>
                 )}
diff --git a/js/apps/admin-ui/src/user/EditUser.tsx b/js/apps/admin-ui/src/user/EditUser.tsx
index d4627ae910..53723172a3 100644
--- a/js/apps/admin-ui/src/user/EditUser.tsx
+++ b/js/apps/admin-ui/src/user/EditUser.tsx
@@ -55,6 +55,7 @@ import { toUsers } from "./routes/Users";
 import { isLightweightUser } from "./utils";
 import { getUnmanagedAttributes } from "../components/users/resource";
 import "./user-section.css";
+import { KeyValueType } from "../components/key-value-form/key-value-convert";
 
 export default function EditUser() {
   const { t } = useTranslation();
@@ -63,7 +64,15 @@ export default function EditUser() {
   const { hasAccess } = useAccess();
   const { id } = useParams<UserParams>();
   const { realm: realmName } = useRealm();
-  const form = useForm<UserFormFields>({ mode: "onChange" });
+  // Validation of form fields is performed on server, thus we need to clear all errors before submit
+  const clearAllErrorsBeforeSubmit = async (values: UserFormFields) => ({
+    values,
+    errors: {},
+  });
+  const form = useForm<UserFormFields>({
+    mode: "onChange",
+    resolver: clearAllErrorsBeforeSubmit,
+  });
   const [realm, setRealm] = useState<RealmRepresentation>();
   const [user, setUser] = useState<UIUserRepresentation>();
   const [bruteForced, setBruteForced] = useState<BruteForced>();
@@ -147,9 +156,46 @@ export default function EditUser() {
       refresh();
     } catch (error) {
       if (isUserProfileError(error)) {
-        setUserProfileServerError(error, form.setError, ((key, param) =>
-          t(key as string, param as any)) as TFunction);
-        addError("userNotSaved", error);
+        if (
+          isUnmanagedAttributesEnabled &&
+          Array.isArray(data.unmanagedAttributes)
+        ) {
+          const unmanagedAttributeErrors: object[] = new Array(
+            data.unmanagedAttributes.length,
+          );
+          let someUnmanagedAttributeError = false;
+          setUserProfileServerError<UserFormFields>(
+            error,
+            (field, params) => {
+              if (field.startsWith("attributes.")) {
+                const attributeName = field.substring("attributes.".length);
+                (data.unmanagedAttributes as KeyValueType[]).forEach(
+                  (attr, index) => {
+                    if (attr.key === attributeName) {
+                      unmanagedAttributeErrors[index] = params;
+                      someUnmanagedAttributeError = true;
+                    }
+                  },
+                );
+              } else {
+                form.setError(field, params);
+              }
+            },
+            ((key, param) => t(key as string, param as any)) as TFunction,
+          );
+          if (someUnmanagedAttributeError) {
+            form.setError(
+              "unmanagedAttributes",
+              unmanagedAttributeErrors as any,
+            );
+          }
+        } else {
+          setUserProfileServerError<UserFormFields>(error, form.setError, ((
+            key,
+            param,
+          ) => t(key as string, param as any)) as TFunction);
+        }
+        addError("userNotSaved", "");
       } else {
         addError("userCreateError", error);
       }
diff --git a/js/apps/admin-ui/src/user/form-state.ts b/js/apps/admin-ui/src/user/form-state.ts
index edb91a8668..b1672b8b45 100644
--- a/js/apps/admin-ui/src/user/form-state.ts
+++ b/js/apps/admin-ui/src/user/form-state.ts
@@ -8,7 +8,7 @@ import { beerify, debeerify } from "../util";
 
 export type UserFormFields = Omit<
   UIUserRepresentation,
-  "attributes" | "userProfileMetadata | unmanagedAttributes"
+  "attributes" | "userProfileMetadata" | "unmanagedAttributes"
 > & {
   attributes?: KeyValueType[] | Record<string, string | string[]>;
   unmanagedAttributes?: KeyValueType[] | Record<string, string | string[]>;
diff --git a/js/libs/ui-shared/src/user-profile/utils.ts b/js/libs/ui-shared/src/user-profile/utils.ts
index 329bab7fbc..2f1ae49117 100644
--- a/js/libs/ui-shared/src/user-profile/utils.ts
+++ b/js/libs/ui-shared/src/user-profile/utils.ts
@@ -69,7 +69,7 @@ export function setUserProfileServerError<T>(
     setError(fieldName(e.field) as keyof T, {
       message: t(e.errorMessage, {
         ...params,
-        defaultValue: e.field,
+        defaultValue: e.errorMessage || e.field,
       }),
       type: "server",
     });