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Showing content from https://github.com/StackExchange/StackExchange.Redis/issues/2233 below:

Creating 2nd connection to to Redis sentinel deployment using the same ConfigurationOptions instance fails with exception. · Issue #2233 · StackExchange/StackExchange.Redis · GitHub

Creating 2nd connection to to Redis sentinel deployment using the same ConfigurationOptions instance fails with exception.

Creating multiple connections with the same configuration instance should succeed.

Failure with exception.
It looks like ConfigurationOptions instance passed to ConnectionMultiplexer.Connect is getting modified.

NOTE: Cloning ConfigurationOptions before connect also does not work.

Redis sentinel deployment with 2 slaves : Docker compose is attached.
OS : Ubuntu 20.04 LTS
.NET Core Version : 3.1.25
Redis NuGet Package Version: StackExchange.Redis 2.5.61

Start the sentinel cluster with default sentinel port

docker-compose up --scale redis-sentinel=3 -d

Run the below sample application.
Demo sample program

using System;
using System.IO;
using System.Net;
using System.Net.NetworkInformation;
using System.Runtime.InteropServices;
using StackExchange.Redis;

namespace netcore31
{
    class Program
    {
        static void Main(string[] args)
        {
            ConfigurationOptions configurationOptions =  ConfigurationOptions.Parse("localhost");
            configurationOptions.ServiceName = "mymaster";
            configurationOptions.Password = "str0ng_passw0rd";
            
            // 1st Connection
             using var firstConnection = ConnectionMultiplexer.Connect(configurationOptions);
             System.Console.WriteLine(firstConnection.GetStatus());
             IDatabase database = firstConnection.GetDatabase();
             database.StringSet("SomeKey","SomeValue");
             System.Console.WriteLine(database.StringGet("SomeKey"));

             
             // Eastblishing second connection 2nd throws exception
             using var secondConnection = ConnectionMultiplexer.Connect(configurationOptions);
            
             System.Console.WriteLine(secondConnection.GetStatus());
      }
  }
}

ConfigurationOptions object passed to ConnectionMultiplexer.Connect is getting changed hence

https://hub.docker.com/r/bitnami/redis-sentinel/

version: '2'

networks:
  app-tier:
    driver: bridge

services:
  redis:
    image: 'bitnami/redis:latest'
    environment:
      - REDIS_REPLICATION_MODE=master
      - REDIS_PASSWORD=str0ng_passw0rd
    networks:
      - app-tier
    ports:
      - '6379'
  redis-slave:
    image: 'bitnami/redis:latest'
    environment:
      - REDIS_REPLICATION_MODE=slave
      - REDIS_MASTER_HOST=redis
      - REDIS_MASTER_PASSWORD=str0ng_passw0rd
      - REDIS_PASSWORD=str0ng_passw0rd
    ports:
      - '6379'
    depends_on:
      - redis
    networks:
      - app-tier
  redis-sentinel:
    image: 'bitnami/redis-sentinel:latest'
    environment:
      - REDIS_MASTER_PASSWORD=str0ng_passw0rd
    depends_on:
      - redis
      - redis-slave
    ports:
      - '26379-26381:26379'
    networks:
      - app-tier

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