diff --git a/src/pages/TeachersUnite/IntroSchoolPrincipalPage.js b/src/pages/TeachersUnite/IntroSchoolPrincipalPage.js
index 207ff0664053..91f24721f6d2 100644
--- a/src/pages/TeachersUnite/IntroSchoolPrincipalPage.js
+++ b/src/pages/TeachersUnite/IntroSchoolPrincipalPage.js
@@ -19,6 +19,7 @@ import Navigation from '../../libs/Navigation/Navigation';
 import TeachersUnite from '../../libs/actions/TeachersUnite';
 import useLocalize from '../../hooks/useLocalize';
 import * as ValidationUtils from '../../libs/ValidationUtils';
+import * as LoginUtils from '../../libs/LoginUtils';
 
 const propTypes = {
     /** Login list for the user that is signed in */
@@ -74,6 +75,9 @@ function IntroSchoolPrincipalPage(props) {
             if (!_.isEmpty(values.partnerUserID) && !Str.isValidEmail(values.partnerUserID)) {
                 ErrorUtils.addErrorMessage(errors, 'partnerUserID', translate('teachersUnitePage.error.enterValidEmail'));
             }
+            if (!_.isEmpty(values.partnerUserID) && LoginUtils.isEmailPublicDomain(values.partnerUserID)) {
+                ErrorUtils.addErrorMessage(errors, 'partnerUserID', translate('teachersUnitePage.error.tryDifferentEmail'));
+            }
 
             return errors;
         },