diff --git a/CHANGELOG.md b/CHANGELOG.md
index d6798acea..f767bc131 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## [10.1.0] IN PROGRESS
 
 * Don't display affiliations of users with types `patron` or `dcb`. Refs UIU-2967.
+* Make the `username` field required for users with the `staff` type in ECS mode. Refs UIU-2970.
 
 ## [10.0.0](https://github.com/folio-org/ui-users/tree/v10.0.0) (2023-10-13)
 [Full Changelog](https://github.com/folio-org/ui-users/compare/v9.0.3...v10.0.0)
diff --git a/src/components/EditSections/EditExtendedInfo/EditExtendedInfo.js b/src/components/EditSections/EditExtendedInfo/EditExtendedInfo.js
index 8829ce510..dd98c3e5a 100644
--- a/src/components/EditSections/EditExtendedInfo/EditExtendedInfo.js
+++ b/src/components/EditSections/EditExtendedInfo/EditExtendedInfo.js
@@ -12,7 +12,10 @@ import {
   Datepicker,
   Headline,
 } from '@folio/stripes/components';
-import { IfPermission } from '@folio/stripes/core';
+import {
+  IfPermission,
+  stripesShape,
+} from '@folio/stripes/core';
 
 import { withFormValues } from '../../Wrappers';
 import asyncValidateField from '../../validators/asyncValidateField';
@@ -21,6 +24,10 @@ import {
   addressTypesShape,
   departmentsShape,
 } from '../../../shapes';
+import {
+  isConsortiumEnabled,
+  isStaffUser,
+} from '../../util';
 
 import CreateResetPasswordControl from './CreateResetPasswordControl';
 import RequestPreferencesEdit from './RequestPreferencesEdit';
@@ -41,6 +48,7 @@ class EditExtendedInfo extends Component {
     values: PropTypes.object,
     uniquenessValidator: PropTypes.object,
     disabled: PropTypes.bool,
+    stripes: stripesShape,
   };
 
   buildAccordionHeader = () => {
@@ -85,6 +93,8 @@ class EditExtendedInfo extends Component {
       change,
       uniquenessValidator,
       disabled,
+      values,
+      stripes,
     } = this.props;
 
     const accordionHeader = this.buildAccordionHeader();
@@ -92,6 +102,7 @@ class EditExtendedInfo extends Component {
     const addresses = this.getAddresses();
     const defaultDeliveryAddressTypeId = this.getDefaultDeliveryAddressTypeId();
     const deliveryAvailable = this.isDeliveryAvailable();
+    const isUsernameFieldRequired = isConsortiumEnabled(stripes) && isStaffUser(values);
 
     return (
       <Accordion
@@ -195,6 +206,7 @@ class EditExtendedInfo extends Component {
               fullWidth
               validStylesEnabled
               disabled={disabled}
+              required={isUsernameFieldRequired}
               validate={asyncValidateField('username', username, uniquenessValidator)}
             />
           </Col>
diff --git a/src/components/EditSections/EditExtendedInfo/EditExtendedInfo.test.js b/src/components/EditSections/EditExtendedInfo/EditExtendedInfo.test.js
index 37cb243c6..20553a94b 100644
--- a/src/components/EditSections/EditExtendedInfo/EditExtendedInfo.test.js
+++ b/src/components/EditSections/EditExtendedInfo/EditExtendedInfo.test.js
@@ -2,7 +2,9 @@ import { screen } from '@folio/jest-config-stripes/testing-library/react';
 import { Form } from 'react-final-form';
 import PropTypes from 'prop-types';
 
+import buildStripes from '__mock__/stripes.mock';
 import renderWithRouter from 'helpers/renderWithRouter';
+import { USER_TYPES } from '../../../constants';
 import EditExtendedInfo from './EditExtendedInfo';
 
 jest.unmock('@folio/stripes/components');
@@ -22,7 +24,7 @@ const arrayMutators = {
   update: jest.fn()
 };
 
-const renderEditExtendedInfo = (props) => {
+const renderEditExtendedInfo = (props, initialValues) => {
   const component = () => (
     <>
       <EditExtendedInfo {...props} />
@@ -35,6 +37,7 @@ const renderEditExtendedInfo = (props) => {
       mutators={{
         ...arrayMutators
       }}
+      initialValues={initialValues}
       onSubmit={onSubmit}
       render={component}
     />
@@ -67,6 +70,7 @@ const props = {
   }],
   values: {},
   uniquenessValidator: {},
+  stripes: buildStripes(),
 };
 const DepartmentsName = ({ departments }) => {
   return departments.map((dep) => {
@@ -125,4 +129,51 @@ describe('Render Extended User Information component', () => {
     renderEditExtendedInfo({ ...props, disabled: true });
     expect(screen.getAllByRole('textbox')[0]).toBeDisabled();
   });
+
+  describe('Username field', () => {
+    it('should be required for users with the \'staff\' type in ECS mode', () => {
+      renderEditExtendedInfo(
+        {
+          ...props,
+          stripes: {
+            ...props.stripes,
+            hasInterface: () => true,
+          },
+        },
+        { type: USER_TYPES.STAFF }
+      );
+
+      expect(screen.getByRole('textbox', { name: 'ui-users.information.username' })).toBeRequired();
+    });
+
+    it('should NOT be required if user type is other than \'staff\' in ECS mode', () => {
+      renderEditExtendedInfo(
+        {
+          ...props,
+          stripes: {
+            ...props.stripes,
+            hasInterface: () => true,
+          },
+        },
+        { type: USER_TYPES.PATRON }
+      );
+
+      expect(screen.getByRole('textbox', { name: 'ui-users.information.username' })).not.toBeRequired();
+    });
+
+    it('should NOT be required in default mode (non ECS)', () => {
+      renderEditExtendedInfo(
+        {
+          ...props,
+          stripes: {
+            ...props.stripes,
+            hasInterface: (i) => i !== 'consortia',
+          },
+        },
+        { type: USER_TYPES.STAFF }
+      );
+
+      expect(screen.getByRole('textbox', { name: 'ui-users.information.username' })).not.toBeRequired();
+    });
+  });
 });
diff --git a/src/components/util/util.js b/src/components/util/util.js
index aa4d1ce03..64bcf990c 100644
--- a/src/components/util/util.js
+++ b/src/components/util/util.js
@@ -203,6 +203,7 @@ export const getRequestUrl = (barcode, userId) => {
 
 export const isPatronUser = (user) => user?.type === USER_TYPES.PATRON;
 export const isDcbUser = (user) => user?.type === USER_TYPES.DCB;
+export const isStaffUser = (user) => user?.type === USER_TYPES.STAFF;
 
 export const isAffiliationsEnabled = (user) => {
   return !isPatronUser(user) && !isDcbUser(user);
diff --git a/src/views/UserEdit/UserForm.js b/src/views/UserEdit/UserForm.js
index f96fb888f..98c5d75b2 100644
--- a/src/views/UserEdit/UserForm.js
+++ b/src/views/UserEdit/UserForm.js
@@ -369,6 +369,7 @@ class UserForm extends React.Component {
                     departments={formData.departments}
                     uniquenessValidator={uniquenessValidator}
                     disabled={isShadowUser}
+                    stripes={stripes}
                   />
                   <EditContactInfo
                     accordionId="contactInfo"