Can't open Memory Mapped File

I'm using memory mapping to pull a variable from an external program. When I try to run my client in a C# project not tied to Unity, it works fine. However, when I attempt to build this functionality into a script within Unity itself, I am unable to open the file and the program does not complete. I'm very new to Unity and the concept of memory mapping, so am I missing something obvious here? Same result with both a local mapping and global.

C# Client Code

 using System;
 using System.IO.MemoryMappedFiles;
 using System.Runtime.InteropServices;
 
 
 namespace ConsoleApp1
 {
   
     class Program
     {
         static void Main(string[] args)
         {
             using (MemoryMappedFile mmf = MemoryMappedFile.OpenExisting("Global\\Local\\MyFileMap"))
             using (MemoryMappedViewAccessor accessor = mmf.CreateViewAccessor())
             {
                
             
                     int takeoffStatus = accessor.ReadByte(0);
                     Console.WriteLine(takeoffStatus);
                 
             }
             
             }
             
     }
 }

Unity Code

 using System;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using System.IO.MemoryMappedFiles;
 using System.Runtime.InteropServices;
 
 
 public class abortScript : MonoBehaviour
 {
 
     // Use this for initialization
     void Start()
     {
         
 
     }
 
     // Update is called once per frame
     void Update()
     {
 
         using (MemoryMappedFile mmf = MemoryMappedFile.OpenExisting("Global\\Local\\MyFileMap"))
         using (MemoryMappedViewAccessor accessor = mmf.CreateViewAccessor())
         {
             byte[] buffer = new byte[10];
             
             for (int index = 0; index < 1; index++)
             {
                 int takeoffStatus = accessor.ReadByte(index);
                 
             }
         }
 
 
 
 
     }
         
             
     
         
         
     
 }

Thanks in advance