Connecting to SharePoint Online with PnP PowerShell Using Interactive Authentication

Introduction

Before any SharePoint Online administration or automation task can be executed, the first and most important step is establishing a secure connection to the target site. Whether the goal is exporting users, auditing permissions, generating reports, provisioning lists, or managing document libraries, every script begins with authentication.

PnP PowerShell has become the preferred administration module for SharePoint Online because it provides hundreds of high-level cmdlets built on top of Microsoft’s supported APIs. Instead of dealing directly with CSOM or Microsoft Graph authentication flows, administrators can focus on solving business problems using concise and readable PowerShell commands.

This article presents a reusable connection script based on Interactive Authentication, which is the recommended approach for administrators and developers executing scripts manually while still benefiting from modern authentication, Multi-Factor Authentication (MFA), and Conditional Access policies.

Why Use PnP PowerShell?

PnP PowerShell is an open-source administration module maintained by the Microsoft 365 Patterns and Practices (PnP) community. It provides a modern PowerShell experience for SharePoint Online and Microsoft 365 administration.

Some advantages include:

• Simplified authentication
• Modern Authentication support
• MFA compatibility
• Hundreds of SharePoint cmdlets
• Microsoft Graph integration
• Site, List, Library and Permission management
• Provisioning support
• Cross-platform compatibility (Windows, Linux and macOS)

For SharePoint Online administration, PnP PowerShell is generally the first tool administrators should consider before implementing custom C# applications.

Interactive Authentication

Interactive authentication opens the Microsoft sign-in page in the user’s browser.

Unlike legacy authentication methods, this approach:

• Supports Multi-Factor Authentication (MFA)
• Honors Conditional Access policies
• Uses Microsoft Entra ID authentication
• Does not require storing passwords in scripts
• Executes commands using the signed-in user’s permissions

Since September 2024, PnP PowerShell requires administrators to authenticate using their own Microsoft Entra ID App Registration. This means every connection must specify a Client ID.

Required Prerequisites

Before running the script, ensure that:

• PnP PowerShell is installed.
• A Microsoft Entra ID App Registration exists.
• The application’s Client ID is available.
• The user has permission to access the SharePoint site.
• Microsoft 365 authentication is allowed.

Connection Script

# =====================================================================
# SharePoint Online - Connect to Site
# =====================================================================
Clear-Host
Write-Host ""
Write-Host "==============================================" -ForegroundColor Cyan
Write-Host " SharePoint Online - Connect to Site" -ForegroundColor Cyan
Write-Host "==============================================" -ForegroundColor Cyan
Write-Host ""
# Verify whether PnP PowerShell is installed
if (-not (Get-Module -ListAvailable -Name PnP.PowerShell))
{
    Write-Host "PnP.PowerShell is not installed." -ForegroundColor Yellow
    Write-Host "Installing PnP.PowerShell..." -ForegroundColor Yellow
    Install-Module PnP.PowerShell -Scope CurrentUser -Force
    Write-Host "PnP.PowerShell installed successfully." -ForegroundColor Green
}
Import-Module PnP.PowerShell
# Microsoft Entra ID App Registration Client ID
$ClientId = "YOUR-CLIENT-ID"
# Prompt for the SharePoint Site URL
$SiteUrl = Read-Host "Enter the SharePoint Site URL"
# Connect to SharePoint Online
Connect-PnPOnline `
    -Url $SiteUrl `
    -ClientId $ClientId `
    -Interactive
# Retrieve site information
$Web = Get-PnPWeb
Write-Host ""
Write-Host "Connected successfully!" -ForegroundColor Green
Write-Host "Site Title : $($Web.Title)"
Write-Host "Site URL   : $($Web.Url)"
Write-Host ""

Script Walkthrough

Step 1 – Verify the Module

Get-Module -ListAvailable -Name PnP.PowerShell

The script first checks whether the PnP PowerShell module is already installed.

If it is missing, it is automatically installed using:

Install-Module PnP.PowerShell -Scope CurrentUser -Force

This makes the script portable across different workstations and avoids manual preparation.

Step 2 – Import the Module

Import-Module PnP.PowerShell

Importing the module loads all available PnP cmdlets into the current PowerShell session.

Step 3 – Read the Site URL

Instead of hardcoding the SharePoint URL, the script prompts the administrator:

$SiteUrl = Read-Host "Enter the SharePoint Site URL"

This allows the same script to be reused for any SharePoint Online site.

Step 4 – Connect to SharePoint Online

Connect-PnPOnline `
    -Url $SiteUrl `
    -ClientId $ClientId `
    -Interactive

This command opens the Microsoft authentication window.

After successful authentication:

• Microsoft Entra ID validates the identity.
• MFA is performed if required.
• Conditional Access policies are enforced.
• An access token is issued.
• The PnP session is established.

No passwords are stored anywhere in the script.

Step 5 – Validate the Connection

$Web = Get-PnPWeb

Retrieving the current web confirms that authentication succeeded.

The script then displays:

• Site Title
• Site URL

This simple validation immediately confirms that subsequent administrative operations can safely continue.

Why Validate the Connection?

Many administrators immediately start executing commands after authentication.

A better approach is to validate the connection first.

If authentication fails, network connectivity is interrupted, or the user lacks permissions, the script stops before executing any administrative operation.

This simple validation improves reliability and makes troubleshooting significantly easier.

Reusing the Connection

Once the connection has been established, every PnP cmdlet uses the current authenticated context.

For example:

Get-PnPUser

Get-PnPList

Get-PnPFolder

Get-PnPWeb

Get-PnPSite

Get-PnPGroup

No additional authentication is required until the session expires.

Recommended Project Structure

As your library of SharePoint administration scripts grows, it is recommended to isolate the connection logic into a dedicated file.

Example:

Scripts
│
├── Connect-SharePoint.ps1
├── Export-SiteUsers.ps1
├── Export-SitePermissions.ps1
├── Export-Libraries.ps1
├── Export-Lists.ps1
├── Export-Groups.ps1
└── Export-SiteInventory.ps1

Each administrative script simply imports the connection helper before executing its own business logic.

This approach provides:

• Centralized authentication
• Easier maintenance
• Cleaner scripts
• Improved code reuse
• Consistent behavior across all administration tools

Best Practices

• Never hardcode usernames or passwords.
• Use Interactive Authentication for administrator-driven scripts.
• Always validate the connection before executing administrative commands.
• Keep the Client ID in a configuration file or environment variable whenever possible.
• Separate authentication logic from reporting logic.
• Build reusable modules instead of duplicating connection code.

Conclusion

Establishing a reliable connection is the foundation of every SharePoint Online administration script. By using PnP PowerShell with Interactive Authentication, administrators benefit from Microsoft’s modern authentication platform while maintaining compatibility with MFA and enterprise security policies.

The connection helper presented in this article is intentionally simple, reusable, and suitable as the starting point for a complete SharePoint administration toolkit. Whether the next task is exporting users, auditing permissions, inventorying document libraries, or generating governance reports, every script can begin from this common authentication layer, resulting in cleaner code, easier maintenance, and a more consistent automation framework.

Official References

• Microsoft Learn – SharePoint Online Documentation
  https://learn.microsoft.com/sharepoint/
• Microsoft Learn – Microsoft Entra ID
  https://learn.microsoft.com/entra/
• PnP PowerShell Documentation
  https://pnp.github.io/powershell/
• PnP PowerShell Authentication
  https://pnp.github.io/powershell/articles/authentication.html
• PnP PowerShell Cmdlets
  https://pnp.github.io/powershell/cmdlets/
• Microsoft 365 Patterns and Practices (PnP)
  https://pnp.github.io/