ASP.NET Core Session state is changed any node

Question

We use a DistributedSqlServerCache and load balance for session state in web farm, so when set session and get session if change node or server would not read session,

Create table in SQL:

SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[BlogsCache]
(
    [Id] [nvarchar](449) NOT NULL,
    [Value] [varbinary](max) NOT NULL,
    [ExpiresAtTime] [datetimeoffset](7) NOT NULL,
    [SlidingExpirationInSeconds] [bigint] NULL,
    [AbsoluteExpiration] [datetimeoffset](7) NULL,

    PRIMARY KEY CLUSTERED ([Id] ASC)
                WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, 
                      IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, 
                      ALLOW_PAGE_LOCKS = ON, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

My startup

 services.AddDistributedSqlServerCache(options =>
        {
            options.ConnectionString = Configuration.GetConnectionString("DbConnection");
            options.SchemaName = Configuration.GetConnectionString("SchemaName");
            options.TableName = Configuration.GetConnectionString("TableName");
        });

 services.AddSession(options =>
        {
            options.IdleTimeout = TimeSpan.FromMinutes(30);
            options.Cookie.IsEssential = true;
        });

And also add session in the Configure method

app.UseSession();

Set and get session

var sessionValue = context.Session.GetString("MySessionKey");

if (sessionValue is null)
    context.Session.SetString("MySessionKey", DateTime.Now.ToString());

await context.Response.WriteAsync($"Session id is {context.Session.Id}\n");
await context.Response.WriteAsync($"Session set is {SessionValue}\n");

When publishing to one server, everything was ok, but publishing to web farm by load balance, when I refresh page, MySessionKey and Session.Id also cookie are changed.

Session insert to database but when load balancer change node can not read session.

Our old project was ASP.NET MVC 5, and we added machine key that get from IIS on web.config.

Is adding a machine key in web.config necessary for ASP.NET Core?