I am trying to share a session between two C# microservices using Redis. Currently, RedisDB is only adding keys with the format AuthMicroservice:* and an empty DataProtectionKeys entry. When the second microservice attempts to retrieve the session using HttpContext.Session.GetString(“UserId”), it returns null.

Here’s what I have so far:
Session Configuration in AuthMicroservice (is storing cookie session): :

var redisConnectionString = builder.Configuration.GetConnectionString("RedisConnection");
var redis = redisConnectionString != null ? ConnectionMultiplexer.Connect(redisConnectionString) : null;

builder.Services.AddDataProtection()
    .PersistKeysToStackExchangeRedis(redis, "DataProtectionKeys");

builder.Services.AddStackExchangeRedisCache(option =>
{
    option.Configuration = redisConnectionString;
    option.InstanceName = "AuthMicroservice:";
});

// Configure Session
builder.Services.AddSession(options =>
{
    options.IdleTimeout = TimeSpan.FromDays(15);
    options.Cookie.MaxAge = TimeSpan.FromDays(15);
    options.Cookie.Name = "Session";
    options.Cookie.HttpOnly = true;
    options.Cookie.IsEssential = true;
});`

and MicroService session:

var redisConnectionString = builder.Configuration.GetConnectionString("RedisConnection");
var redis = redisConnectionString != null ? ConnectionMultiplexer.Connect(redisConnectionString) : null;
builder.Services.AddStackExchangeRedisCache(option =>
{
    option.Configuration = redisConnectionString;
    option.InstanceName = "GameMicroservice:";
});

// Configure Session
builder.Services.AddSession(options =>
{
    options.IdleTimeout = TimeSpan.FromDays(15);
    options.Cookie.MaxAge = TimeSpan.FromDays(15);
    options.Cookie.Name = "Session";
    options.Cookie.HttpOnly = true;
    options.Cookie.IsEssential = true;
});

What could be causing this issue, and how can I properly share the session between the two microservices?