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Fix GraphServiceClient MissingMethodException in SharePoint

Tauseeq Magsi Sep 28, 2026 869 views

Question details

The user needs to resolve a MissingMethodException when instantiating the GraphServiceClient in a SharePoint Server farm solution.

Fix GraphServiceClient MissingMethodException in SharePoint Farm Solutions

Product: Microsoft SharePoint Server / Microsoft Graph API
Device & OS: not provided
Scenario: Deploying a SharePoint Server Subscription Edition farm solution targeting .NET Framework 4.8 using Microsoft.Graph 5.49.0 and Azure.Identity 1.11.2.
Observed behavior: The Microsoft Graph API code executes successfully in a console application but throws a MissingMethodException at the GraphServiceClient constructor when run within the SharePoint farm solution.

Before you start

Ensure you have collected the full stack trace of the exception, your complete project reference list, and the exact version numbers of all assemblies deployed to the SharePoint Global Assembly Cache (GAC).

Solution 1Recommended

Verify Assembly Dependencies and Consult Microsoft Graph Support

SharePoint farm solutions strictly manage dependencies via the Global Assembly Cache (GAC). This error typically arises from assembly version conflicts requiring precise binding redirects or expert troubleshooting.

Farm solutions in SharePoint operate in an environment where core dependencies (like System.Text.Json or memory management libraries used by Azure.Identity) may clash with SharePoint's built-in libraries. This results in the runtime loading an older assembly version that lacks the method expected by your newer Microsoft Graph SDK package.

Check deployed GAC assemblies

Navigate to your SharePoint server's Global Assembly Cache and verify the exact assembly versions for Microsoft.Graph, Azure.Identity, and their dependencies.

Review Web.config binding redirects

Open your SharePoint Web application's Web.config file and ensure it contains the correct assembly binding redirects for all dependencies utilized by the Microsoft Graph SDK.

Gather diagnostic information

Document the complete MissingMethodException stack trace, the exact GraphServiceClient constructor call you are using, and your .csproj file references.

Post in the Microsoft Graph Users Forum

Visit the dedicated Microsoft Q&A forum for Microsoft Graph (docs.microsoft.com/en-us/answers/topics/microsoft-graph-users.html) and post your collected logs. Graph specialists can investigate specific SharePoint farm compatibility issues and provide exact binding configurations.

Verify Assembly Dependencies and Consult Microsoft Graph Support

Assembly Conflicts in .NET 4.8: A MissingMethodException at runtime in .NET Framework 4.8 is a classic symptom of DLL hell, where the application compiles successfully against a new DLL but loads an older DLL at runtime.

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Frequently Asked Questions

Why does GraphServiceClient work in a console app but fail in SharePoint?

Console applications resolve dependencies locally from their bin/output folder. In contrast, SharePoint farm solutions rely on the Global Assembly Cache (GAC) and the web application's Web.config, frequently leading to assembly version conflicts with older built-in SharePoint libraries.

How do I fix assembly conflicts in SharePoint farm solutions?

You must implement precise assembly binding redirects in the SharePoint Web.config file for the conflicting assemblies (such as Azure.Identity dependencies like System.Text.Json) to force the runtime to load the correct version.

What causes a MissingMethodException in .NET Framework 4.8?

This exception occurs at runtime when the application attempts to call a method that was present in the assembly version referenced during compilation, but is missing in the older assembly version that the application domain actually loaded at runtime.

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