Standard library usage problem

I have a standard library I want to use in my 8.0 and 4.7.2 projects.

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
    <Nullable>enable</Nullable>
    <LangVersion>8.0</LangVersion>
  </PropertyGroup>


However, when added as a reference to the Framework project, the class gives errors that the namespace can't be found.

And for the 8.0 project, the class is fine, but it won't build.
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