diff --git a/src/ReC.Application/Common/Validations/AuthScopedValidator.cs b/src/ReC.Application/Common/Validations/AuthScopedValidator.cs
new file mode 100644
index 0000000..c41d654
--- /dev/null
+++ b/src/ReC.Application/Common/Validations/AuthScopedValidator.cs
@@ -0,0 +1,14 @@
+using FluentValidation;
+using ReC.Application.Common.Interfaces;
+
+namespace ReC.Application.Common.Validations;
+
+public class AuthScopedValidator : AbstractValidator<IAuthScoped>
+{
+    public AuthScopedValidator()
+    {
+        RuleFor(x => x.AddedWho)
+            .NotEmpty()
+            .WithMessage("The 'AddedWho' field is required. A missing value may indicate an API configuration issue. Please contact your system administrator for assistance.");
+    }
+}
diff --git a/src/ReC.Infrastructure/DependencyInjection.cs b/src/ReC.Infrastructure/DependencyInjection.cs
index 309c59b..b731e33 100644
--- a/src/ReC.Infrastructure/DependencyInjection.cs
+++ b/src/ReC.Infrastructure/DependencyInjection.cs
@@ -1,7 +1,9 @@
 using DigitalData.Core.Infrastructure;
+using FluentValidation;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
 using ReC.Application.Common.Interfaces;
+using ReC.Application.Common.Validations;
 using ReC.Domain.Entities;
 
 namespace ReC.Infrastructure;
@@ -23,6 +25,8 @@ public static class DependencyInjection
 
         services.AddDbRepository(opt => opt.RegisterFromAssembly<TRecDbContext>(typeof(RecActionView).Assembly));
 
+        services.AddValidatorsFromAssembly(typeof(AuthScopedValidator).Assembly);
+
         return services;
     }