Hi @Luke Ferguson ,
Welcome to Microsoft Q&A!
Are you using Package Source Mapping? If no, you can remove all package source mappings by going to Tools > Options > NuGet Package Manager > Package Source Mapping > Remove All.
Meanwhile, you can close all running VS instances and open the NuGet.Config (%APPDATA%\NuGet) file with the Notepad. Then, check the package sources keys as the following:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<packageSources>
<add key="nuget.org" value=https://api.nuget.org/v3/index.json protocolVersion="3" />
<add key="Microsoft Visual Studio Offline Packages" value="C:\Program Files (x86)\Microsoft SDKs\NuGetPackages\" />
</packageSources>
<packageRestore>
<add key="enabled" value="True" />
<add key="automatic" value="True" />
</packageRestore>
<bindingRedirects>
<add key="skip" value="False" />
</bindingRedirects>
<packageManagement>
<add key="disabled" value="False" />
</packageManagement>
</configuration>
Sincerely,
Anna
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