How to make general cookie authentication for 2 asp.net core apps?

Question

I have 2 asp.net core webapis under 1 subdomain, and I'm going to add cookie authentication to one of them based on first api, but it doesn't working. It can't parse cookies from other one. I read some articles about this point, but is didn't help. One of them

1. Sharing Cookies Between Two ASP.NET Core Applications
2. https://learn.microsoft.com/en-us/aspnet/core/security/cookie-sharing?view=aspnetcore-6.0

Info about APIs

1. Using .NET 6, cookie authentication with ASP.NET Core Identity, authentication works fine

   builder.Services.AddIdentity<User.Repository.Entities.User, 
   IdentityRole>(options =>
   {
       options.Password.RequireDigit = false;
       options.SignIn.RequireConfirmedEmail = true;
   })
   .AddEntityFrameworkStores<UserDbContext>()
   .AddDefaultTokenProviders();
   
   builder.Services.ConfigureApplicationCookie(options =>
   {
       options.Cookie.Name = "Custom.Identity";
       options.Cookie.Domain = "custom.com";
       options.Events.OnValidatePrincipal = context =>
       {
           context.Response.StatusCode = StatusCodes.Status401Unauthorized;
           return Task.CompletedTask;
       };
   });
   builder.Services.AddDataProtection()
                   .PersistKeysToFileSystem(new DirectoryInfo("c:\\security-keys"))
                   .SetApplicationName("SharedCookieApp");
   
   builder.Services
       .AddAuthentication()
   

2. Using asp.net core 3, used jwt token auth before, I want to add cookie auth there without ASP.NET Core Identity; Authentication always fails with cookies from first API

       services.AddDataProtection()
           .PersistKeysToFileSystem(new DirectoryInfo("c:\\security-keys"))
           .SetApplicationName("SharedCookieApp");
   
       services.AddAuthentication(options =>
       {
   
           options.DefaultAuthenticateScheme = CookieAuthenticationDefaults.AuthenticationScheme;
           options.DefaultChallengeScheme = CookieAuthenticationDefaults.AuthenticationScheme;
       })
           .AddCookie(options =>
           {
               options.Cookie.Name = "Custom.Identity";
               options.Cookie.Domain = "custom.com";
   
               options.Events.OnValidatePrincipal = context =>
               {
                   context.Response.StatusCode = StatusCodes.Status401Unauthorized;
                   return Task.CompletedTask;
               };
           });
   

P.S. Records from failed API logs.

    Microsoft.AspNetCore.Authentication.Cookies.CookieAuthenticationHandler[7]
          Cookies was not authenticated. Failure message: Unprotect ticket failed

Anybody knows the possible reason of auth failing?