Hello,
Autofac is a third-party tool, it is not supported on Q&A.
From the NuGet Package page, we can see it doesn't support .net9.
I tried to add the latest version of this page in a .NET9 MAUI project, it can be referenced. Since it's a third-party tool and it's not clear if all of the features can be used with .NET9, it's suggested that you create new issue at their GitHub Repo for further help - https://github.com/autofac/Autofac/issues
<ItemGroup>
<PackageReference Include="Autofac" Version="8.2.0" />
</ItemGroup>
Best Regards,
Wenyan Zhang
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