ASP.Net Core 6: JWT Security Token Expiry Time is NULL

Hi,

I am using Asp.Net Core 6. I am using JWT token in my project. I also want to use Cookie. But is it ok to use it this way? When I look at the browser cookies, the domain and expiry time do not appear.

C#

Code

builder.Services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme).AddJwtBearer(options =>
{
    options.TokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuer = true,
        ValidateAudience = true,
        ValidateLifetime = true,
        ValidateIssuerSigningKey = true,
        ValidIssuer = builder.Configuration["Jwt:Issuer"],
        ValidAudience = builder.Configuration["Jwt:Audience"],
        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(builder.Configuration["Jwt:SigningKey"]))
    };
});

app.UseCookiePolicy(new CookiePolicyOptions()
{
    MinimumSameSitePolicy = SameSiteMode.Lax,
    HttpOnly = HttpOnlyPolicy.Always,
    Secure = CookieSecurePolicy.Always,
    ConsentCookie = new CookieBuilder
    {
        Name = "jwt-token",
        Expiration = TimeSpan.MaxValue,
        Domain = ".turkcell.com.tr",
    }
});

C#

Code

TokenRepository 

private const double EXPIRY_DURATION_MINUTES = 30;
public string BuildToken(string key, string issuer, LoginResponse user)
{
    var claims = new[]
    {

            new Claim("Username", user.Username),
            new Claim("IsAgent", user.IsAgent.ToString()),
            new Claim("IsMasterAgent", user.IsMasterAgent.ToString()),
            new Claim("Oid", user.Oid.ToString()),

        };

    var securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(key));
    var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);
    var tokenDescriptor = new JwtSecurityToken(issuer, issuer, claims,
        expires: DateTime.Now.AddMinutes(EXPIRY_DURATION_MINUTES), signingCredentials: credentials);
    return new JwtSecurityTokenHandler().WriteToken(tokenDescriptor);
}

public bool ValidateToken(string key, string issuer, string audience, string token)
{
    var mySecret = Encoding.UTF8.GetBytes(key);
    var mySecurityKey = new SymmetricSecurityKey(mySecret);
    var tokenHandler = new JwtSecurityTokenHandler();
    try
    {
        tokenHandler.ValidateToken(token,
        new TokenValidationParameters
        {
            ValidateIssuerSigningKey = true,
            ValidateIssuer = true,
            ValidateAudience = true,
            ValidIssuer = issuer,
            ValidAudience = issuer,
            IssuerSigningKey = mySecurityKey,
        }, out SecurityToken validatedToken);
    }
    catch
    {
        return false;
    }
    return true;
}