Merge pull request MicrosoftDocs#4025 from MicrosoftDocs/chrisda

Update connect-to-exchange-online-powershell.md

Author: chrisda

exchange/docs-conceptual/exchange-online/connect-to-exchange-online-powershell/connect-to-exchange-online-powershell.md

@@ -59,7 +59,7 @@ Exchange Online PowerShell allows you to manage your Exchange Online settings fr
 > [!TIP]
 > Having problems? Ask for help in the Exchange forums. Visit the forums at: [Exchange Online](https://go.microsoft.com/fwlink/p/?linkId=267542), or [Exchange Online Protection](https://go.microsoft.com/fwlink/p/?linkId=285351).
 
-## Connect to Exchange Online PowerShell
+## Connect to Exchange Online
 
 1. On your local computer, open Windows PowerShell and run the following command.
 
@@ -116,6 +116,8 @@ If you receive errors, check the following requirements:
 
 - TCP port 80 traffic needs to be open between your local computer and Office 365. It's probably open, but it's something to consider if your organization has a restrictive internet access policy.
 
+- If your organization uses federated authentication, and your identity provider (IDP) and/or security token service (STS) isn't publicly available, you can't use a federated account to connect to Exchange Online PowerShell. Instead, create and use a non-federated account in Office 365 to connect to Exchange Online PowerShell.
+
 ## See also
 
 The cmdlets that you use in this topic are Windows PowerShell cmdlets. For more information about these cmdlets, see the following topics.