net481 
namespace System.IdentityModel
{
    public abstract class SecurityTokenService
    {
        public virtual IAsyncResult BeginCancel(ClaimsPrincipal principal, RequestSecurityToken request, AsyncCallback callback, object state);
    }
}
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.NET Framework 4.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net481
Assembly

System.IdentityModel , Version=4.0.0.0, PublicKeyToken=b77a5c561934e089

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Your project needs an assembly reference to System.IdentityModel.

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