add add-in ban office store note

Author: xiaoharper

articles/machine-learning/studio/excel-add-in-for-web-services.md

@@ -23,7 +23,10 @@ Excel makes it easy to call web services directly without the need to write any
 1. Open the [sample Excel file](https://aka.ms/amlexcel-sample-2), which contains the Excel add-in and data about passengers on the Titanic. 
 
     > [!NOTE]
-    > You will see the list of the Web Services related to the file and at the bottom a checkbox for "Auto-predict". If you enable auto-predict the predictions of **all** your services will be updated every time there is a change on the inputs. If unchecked you will have to click on "Predict All" for refresh. For enabling auto-predict at a service level go to step 6.
+    > - You will see the list of the Web Services related to the file and at the bottom a checkbox for "Auto-predict". If you enable auto-predict the predictions of **all** your services will be updated every time there is a change on the inputs. If unchecked you will have to click on "Predict All" for refresh. For enabling auto-predict at a service level go to step 6.
+    > - The Azure Machine Learning Excel add-in will call Office add-ins store to load. If your organization ban access to Office add-ins store, you will see error when loading the add-in. For this cause, please deploy the Azure Machine Learning Excel add-in from Microsoft 365 admin center. Then invoke the add-in and add the web service manually by paste the URL and API key.
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 2. Choose the web service by clicking it - "Titanic Survivor Predictor (Excel Add-in Sample) [Score]" in this example.