Connect-SPOService: No valid OAuth 2.0 authentication session exists

By Denis Molodtsov

Published in SharePoint

October 18, 2026

1 min read

Connect-SPOService: No valid OAuth 2.0 authentication session exists

The Problem

The Fix

The Problem

The latest SharePoint Online Management Shell module (Microsoft.Online.SharePoint.PowerShell version 16.0.27709.12000) is broken. Signing in with Connect-SPOService fails right after you enter your credentials:

powershell

Connect-SPOService -Url https://contoso-admin.sharepoint.com

Connect-SPOService : No valid OAuth 2.0 authentication session exists
At line:1 char:1
+ Connect-SPOService -Url https://contoso-admin.sharepoint.com
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Connect-SPOService], AuthenticationException
    + FullyQualifiedErrorId : Microsoft.Online.SharePoint.PowerShell.AuthenticationException,Microsoft.Online.SharePoint.PowerShell.ConnectSPOService

I found nothing about this on the forums or in the official documentation.

The Fix

Roll back to version 16.0.27111.12000 (April 2026). With this version, the same command connects without any issues.

powershell

Uninstall-Module Microsoft.Online.SharePoint.PowerShell -AllVersions -Force
Install-Module Microsoft.Online.SharePoint.PowerShell -RequiredVersion 16.0.27111.12000 -Force