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Prerequisites

The PowerShellModuleName variable must already be defined or one of the following values must be set:

$PowerShellModuleName = 'ExchangeOnlineManagement'

Install the PowerShell module

Run the following commands to verify the NuGet provider is installed:

Find-PackageProvider -Name 'NuGet' -Force -ForceBootstrap

Run the following commands to define the name of the PowerShell module trust the PSGallery:

Set-PSRepository -Name 'PSGallery' -InstallationPolicy Trusted

Run the following commands to locate the active PowerShell modules:

$ModuleIsActive = Get-Module -Name $PowerShellModuleName

Run the following commands to locate the installed PowerShell modules

$ModuleIsInstalled = 'ExchangeOnlineManagement'Get-Module -Name $PowerShellModuleName -ListAvailable

Run the following commands to unload the PowerShell modules

If ($ModuleIsActive) { Remove-Module -Name $PowerShellModuleName -Force }

Run the code blocks in one of the following sections commands to update or install the latest version of the Graph PowerShell modules from the PSGallery: 

...

If ($ModuleIsInstalled) { Update-Module -Name $PowerShellModuleName

...

To install or reinstall the modules:

...

...

 } Else { Install-Module -

...

Name $PowerShellModuleName 

...

}