Dotnet Restore cannot find .NET 9 packages (NU1102) even though they exist in internal Artifactory NuGet

We use an internal Artifactory NuGet feed inside our organization.

Here is my NuGet.Config:

<?xml version="1.0" encoding="utf-8"?> <configuration> <packageSources> <add key="ArtifactoryNuGetV3" value="http://ArtifactoryNuGetV3.com/api/nuget/v3/nuget" protocolVersion="3" allowInsecureConnections="True" disableTLSCertificateValidation="True" /> </packageSources> <packageRestore> <add key="enabled" value="True" /> <add key="automatic" value="True" /> </packageRestore> <bindingRedirects> <add key="skip" value="False" /> </bindingRedirects> <packageManagement> <add key="format" value="0" /> <add key="disabled" value="False" /> </packageManagement> </configuration>

When I run:

dotnet restore --configfile [...\NuGet.Config]

I get:

error NU1102: Unable to find package Microsoft.Extensions.Configuration.Abstractions with version (>= 9.0.0) error NU1102: - Found 112 version(s) in ArtifactoryNuGetV3 [ Nearest version: 8.0.0-preview.6.23329.7 ]

Key points:

All missing packages are >= 9.0.0 My project does not reference these packages directly The project’s target framework is .NET 6.0 These packages do exist in our Artifactory NuGet feed (confirmed)

Why is dotnet restore trying to resolve .NET 9 packages in a .NET 6 project, and why can’t it find them even though they exist in Artifactory? How can I fix this?