small update

Author: jansenbe

docs/apis/webhooks/sharepoint-webhooks-using-azure-functions.md

@@ -20,7 +20,8 @@ This will offer you to start your function from a template, in the case of Share
 ![Choosing an Azure Function template](../../../images/webhook-azure-function3.png)
 
 >**Note:**
->Using the **GenericWebHook** template currently does not yet work for SharePoint webhooks but the SharePoint product team is aware of this problem and will address it.
+> - Using the **GenericWebHook** template currently does not yet work for SharePoint webhooks but the SharePoint product team is aware of this problem and will address it.
+> - If you get "Failed to validate the notification URL" errors when using your Azure function based webhook you might be able to resolve this by setting the Authorization level to **Function** and define your function for anonymous access
 
 The result will be a "default" Azure Function written in C#
 ![The default Azure Function](../../../images/webhook-azure-function4.png)