App-Only Authentication for SharePoint Online PowerShell

The latest versions of the SharePoint Online PowerShell module support app-only authentication (certificate-based authentication) for the Connect-SPOService cmdlet. In other words, applications can now connect to SharePoint Online to run administrative cmdlets by presenting a registered Entra ID app and an X.509 certificate instead of the credentials for a human SharePoint administrator. It’s a good change, even if I still prefer using the Graph APIs for SharePoint automation.

https://office365itpros.com/2025/12/02/app-only-authentication-spo/