Merge pull request #116772 from lfittl-msft/clarify-aad-mysql-versions

Add information that AAD integration requires MySQL 5.7 or newer

Author: PRMerger8

articles/mysql/concepts-azure-ad-authentication.md

@@ -69,6 +69,7 @@ Once you have authenticated against the Active Directory, you then retrieve a to
 
 ## Additional considerations
 
+- Azure Active Directory authentication is only available for MySQL 5.7 and newer.
 - Only one Azure AD administrator can be configured for a Azure Database for MySQL server at any time.
 - Only an Azure AD administrator for MySQL can initially connect to the Azure Database for MySQL using an Azure Active Directory account. The Active Directory administrator can configure subsequent Azure AD database users.
 - If a user is deleted from Azure AD, that user will no longer be able to authenticate with Azure AD, and therefore it will no longer be possible to acquire an access token for that user. In this case, although the matching user will still be in the database, it will not be possible to connect to the server with that user.

articles/mysql/howto-configure-sign-in-azure-ad-authentication.md

@@ -12,6 +12,9 @@ ms.date: 01/22/2019
 
 This article will walk you through the steps how to configure Azure Active Directory access with Azure Database for MySQL, and how to connect using an Azure AD token.
 
+> [!IMPORTANT]
+> Azure Active Directory authentication is only available for MySQL 5.7 and newer.
+
 ## Setting the Azure AD Admin user
 
 Only an Azure AD Admin user can create/enable users for Azure AD-based authentication. To create and Azure AD Admin user, please follow the following steps

articles/mysql/howto-connect-with-managed-identity.md

@@ -18,6 +18,9 @@ This article shows you how to use a user-assigned identity for an Azure Virtual
 > * Get an access token using the VM identity and use it to query an Azure Database for MySQL server
 > * Implement the token retrieval in a C# example application
 
+> [!IMPORTANT]
+> Connecting with Managed Identity is only available for MySQL 5.7 and newer.
+
 ## Prerequisites
 
 - If you're not familiar with the managed identities for Azure resources feature, see this [overview](../../articles/active-directory/managed-identities-azure-resources/overview.md). If you don't have an Azure account, [sign up for a free account](https://azure.microsoft.com/free/) before you continue.