diff --git a/components/identity-extensions/org.wso2.carbon.device.mgt.oauth.extensions/src/main/java/org/wso2/carbon/device/mgt/oauth/extensions/validators/PermissionBasedScopeValidator.java b/components/identity-extensions/org.wso2.carbon.device.mgt.oauth.extensions/src/main/java/org/wso2/carbon/device/mgt/oauth/extensions/validators/PermissionBasedScopeValidator.java
index c741abc99ab..cb8d59fb5c8 100644
--- a/components/identity-extensions/org.wso2.carbon.device.mgt.oauth.extensions/src/main/java/org/wso2/carbon/device/mgt/oauth/extensions/validators/PermissionBasedScopeValidator.java
+++ b/components/identity-extensions/org.wso2.carbon.device.mgt.oauth.extensions/src/main/java/org/wso2/carbon/device/mgt/oauth/extensions/validators/PermissionBasedScopeValidator.java
@@ -81,11 +81,12 @@ public class PermissionBasedScopeValidator extends OAuth2ScopeValidator {
             User authzUser = accessTokenDO.getAuthzUser();
             if ((permission != null) && (authzUser != null)) {
                 String username = authzUser.getUserName();
+                String userStore = authzUser.getUserStoreDomain();
                 int tenantId = OAuthExtUtils.getTenantId(authzUser.getTenantDomain());
                 UserRealm userRealm = OAuthExtensionsDataHolder.getInstance().getRealmService().getTenantUserRealm(tenantId);
                 if (userRealm != null && userRealm.getAuthorizationManager() != null) {
                     status = userRealm.getAuthorizationManager()
-                                      .isUserAuthorized(username, permission.getPath(),
+                                      .isUserAuthorized(userStore +"/"+ username, permission.getPath(),
                                                         PermissionMethod.UI_EXECUTE);
                 }
             }
diff --git a/components/webapp-authenticator-framework/org.wso2.carbon.webapp.authenticator.framework/src/main/java/org/wso2/carbon/webapp/authenticator/framework/authenticator/OAuthAuthenticator.java b/components/webapp-authenticator-framework/org.wso2.carbon.webapp.authenticator.framework/src/main/java/org/wso2/carbon/webapp/authenticator/framework/authenticator/OAuthAuthenticator.java
index 72e6134fa6c..adc31a9c143 100644
--- a/components/webapp-authenticator-framework/org.wso2.carbon.webapp.authenticator.framework/src/main/java/org/wso2/carbon/webapp/authenticator/framework/authenticator/OAuthAuthenticator.java
+++ b/components/webapp-authenticator-framework/org.wso2.carbon.webapp.authenticator.framework/src/main/java/org/wso2/carbon/webapp/authenticator/framework/authenticator/OAuthAuthenticator.java
@@ -111,6 +111,10 @@ public class OAuthAuthenticator implements WebappAuthenticator {
                         AuthenticatorFrameworkDataHolder.getInstance().getoAuth2TokenValidationService().validate(dto);
                 if (oAuth2TokenValidationResponseDTO.isValid()) {
                     String username = oAuth2TokenValidationResponseDTO.getAuthorizedUser();
+                    //Remove the userstore domain from username
+                    if (username.contains("/")) {
+                        username = username.substring(username.indexOf('/') + 1);
+                    }
                     authenticationInfo.setUsername(username);
                     authenticationInfo.setTenantDomain(MultitenantUtils.getTenantDomain(username));
                     authenticationInfo.setTenantId(Utils.getTenantIdOFUser(username));