Update app-only-auth-powershell-v2.md

Issue #9962

Author: chrisda

exchange/docs-conceptual/app-only-auth-powershell-v2.md

@@ -50,6 +50,14 @@ The following examples show how to use the Exchange Online PowerShell module wit
 
 > [!IMPORTANT]
 > In the following **Connect-** commands, be sure to use an `.onmicrosoft.com` domain for the _Organization_ parameter value. Otherwise, you might encounter cryptic permission issues when you run commands in the app context.
+>
+> In Microsoft 365 GCC High or DoD environments, the connection commands require the following additional parameters and values:
+>
+> - **Connect-ExchangeOnline in GCC High**: `-ExchangeEnvironmentName O365USGovGCCHigh`.
+> - **Connect-IPPSSession in GCC High**: `-ConnectionUri https://ps.compliance.protection.office365.us/powershell-liveid/ -AzureADAuthorizationEndpointUri https://login.microsoftonline.us/common`.
+>
+> - **Connect-ExchangeOnline in DoD**: `-ExchangeEnvironmentName O365USGovDoD`.
+> - **Connect-IPPSSession in DoD**: `-ConnectionUri https://l5.ps.compliance.protection.office365.us/powershell-liveid/ -AzureADAuthorizationEndpointUri https://login.microsoftonline.us/common`.
 
 - **Connect using a certificate thumbprint**: