Updating PowerShell and the Microsoft 365 administration modules should be a routine maintenance operation. Unfortunately, a currently open regression can make the latest Exchange Online and Microsoft Graph modules fail when they are used in the same PowerShell 7 session.

The failure was first confirmed with PowerShell 7.6.4, ExchangeOnlineManagement 3.10.1, and Microsoft.Graph 2.38.1. A follow-up test with Microsoft.Graph 2.39.0 still found a conflict in the same combined session: Graph connected after the order change, but Exchange Online WAM failed with a RuntimeBroker/NullReferenceException. In the original Nebula flow, the error appeared while Connect-Nebula was establishing the Microsoft Graph session:

Connect-MgGraph:
InteractiveBrowserCredential authentication failed:
Method not found: '!0
Microsoft.Identity.Client.BaseAbstractApplicationBuilder`1.WithLogging(
Microsoft.IdentityModel.Abstractions.IIdentityLogger, Boolean)'.

This is not a permissions, Conditional Access, consent, or token-cache error. It is an in-process assembly dependency conflict between Microsoft modules.

If you ever check both Nebula.KB-dev and kb.gioxx.org, there is one simple rule to keep in mind: the -dev documentation is usually the most up to date.

Introduction​

Microsoft is retiring the -Credential parameter used when connecting to Exchange Online PowerShell. Starting with module versions released in December 2026 and later, the parameter will be removed from both Connect-ExchangeOnline and Connect-IppsSession.

The change moves administrators and automation away from the Resource Owner Password Credentials (ROPC) flow, which cannot satisfy modern protections such as multifactor authentication and Conditional Access.

I have re-enabled the internal Docusaurus blog and, starting today, this space will be one of the reference points for Nebula project updates (the main one is and will remain my personal blog, but this is where English translations of those same articles can live, along with micro-updates that may have an impact on end users).