Any reason why updated version of this library can't stay .netstandard20 or 21? about identityserver4.accesstokenvalidation HOT 3 CLOSED

No. Because ASP.NET Core itself targets netcore31

from identityserver4.accesstokenvalidation.

But .NET Core 3.1 implement .NET Standard 2.1. See.

I'm currently upgrading a ASP.NET Core software from 2.1 to 3.1.

The solution have multiple projects. The main asp net project is now targeting netcoreapp3.1.

The asp net project have a reference to multiple library class that now targets netstandard2.1.

Some of those projects are responsible to configure part of the asp net app. Namely, the authentication.

Because IdentityServer4 don't target netstandard2.1 we can't use the package in a library class project.

from identityserver4.accesstokenvalidation.

I think the OP question has been answered. That's the way it works,

from identityserver4.accesstokenvalidation.