I am having trouble trying to push .net framework packages to github

Commands:

To pack: .nuget\NuGet.exe pack “C:\projects\reponame\ABC.Package” -OutputDirectory “C:\projects\reponame\ABC.Package\bin\Release”
To push .nuget\Nuget.exe push ABC.Package\bin\Release\abc.package.13.1.0.nupkg -Source https://github.com/orgname/repo-name

Have tried adding in a API key param to the nuget push but that returns a 403 forbidden without it prompts for username and password which seems to get a little further before getting a response of "Response status code does not indicate success: 422 (Unprocessable Entity) "

.nuspec file is:

<?xml version="1.0"?>
<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
  <metadata minClientVersion="4.00">
    <repository type="git" url="https://github.com/orgname/repo-name" />
    <id>abc.package</id>
    <version>$version$</version>
    <title>$title$</title>
    <authors>abc</authors>
    <owners>abc</owners>
    <requireLicenseAcceptance>false</requireLicenseAcceptance>
    <description>abc.package</description>
    <releaseNotes>text.</releaseNotes>
    <copyright>Copyright 2020</copyright>
    <tags></tags>
  </metadata>
</package>

Can anyone help or is this not supported by GitHub?