xamarinmac 
namespace System.Security.Claims
{
    public static class PrincipalExtensions
    {
        public static string? FindFirstValue(this ClaimsPrincipal! principal, string! claimType);
    }
}
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.NET 5.06.07.08.09.010.0
.NET Core 2.02.12.23.03.1
.NET Framework 4.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.02.1
Information specific to xamarinmac
Assemblies

Microsoft.Extensions.Identity.Core , Version=10.0.0.0, PublicKeyToken=adb9793829ddae60

Microsoft.Extensions.Identity.Core , Version=9.0.0.0, PublicKeyToken=adb9793829ddae60

Referencing

Your project needs a package reference to Microsoft.Extensions.Identity.Core.

Package Microsoft.Extensions.Identity.Core (10.0.0-preview.1.25120.3) netstandard2.0
Platform Restrictions

This framework does not have platform annotations.

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  • Package-provided API