diff --git a/infrastructure/parallelcluster-ui.yaml b/infrastructure/parallelcluster-ui.yaml
index 0f585060..7f8d90d4 100644
--- a/infrastructure/parallelcluster-ui.yaml
+++ b/infrastructure/parallelcluster-ui.yaml
@@ -1017,6 +1017,9 @@ Outputs:
   AppClientId:
     Description: The id of the Cognito app client
     Value: !Ref CognitoAppClient
+  UserPoolId:
+    Description: The id of Cognito user pool
+    Value: !If [ UseExistingCognito, !Ref UserPoolId, !GetAtt [ Cognito, Outputs.UserPoolId ]]
   UserPoolClientSecretArn:
     Description: The app client secret ARN for ParallelCluster UI.
     Value: !GetAtt UserPoolClientSecret.SecretArn