Recently, if you have been trying to deploy Azure Resource Group template using Visual Studio, you might see below error:

[ERROR] Add-AzureRmAccount : A parameter cannot be found that matches parameter name 
[ERROR] 'EnvironmentName'.
[ERROR] At line:1 char:2379
[ERROR] + ... xmg' -AccountId 'myemail@gmail.com' -EnvironmentName 'AzureC ...
[ERROR] +                                                  ~~~~~~~~~~~~~~~~
[ERROR]     + CategoryInfo          : InvalidArgument: (:) [Add-AzureRmAccount], Param 
[ERROR]    eterBindingException
[ERROR]     + FullyQualifiedErrorId : NamedParameterNotFound,Microsoft.Azure.Commands. 
[ERROR]    Profile.AddAzureRMAccountCommand
[ERROR]  
[ERROR] Run Login-AzureRmAccount to login.

There was a breaking change in the 4.x release of the Azure PowerShell cmdlets, the short term fix is to roll back to 3.8.

If you have used “Install-Module AzureRM” to install the cmdlets, then uninstall and re-install with the -RequiredVersion parameter, e.g.

Install-Module AzureRM -RequiredVersion 3.8.0 -Force -AllowClobber

If you installed the cmdlets via WebPI/MSI/AzureSDK install, then uninstall Azure PowerShell from control panel and install the 3.8 version from https://github.com/Azure/azure-powershell/releases/download/v3.8.0-April2017/azure-powershell.3.8.0.msi

Meanwhile, Microsoft is working on a fix.