diff --git a/EnvelopeGenerator.Application/Common/Extensions/TaskExtensions.cs b/EnvelopeGenerator.Application/Common/Extensions/TaskExtensions.cs
index 2fae57ea..163db9ce 100644
--- a/EnvelopeGenerator.Application/Common/Extensions/TaskExtensions.cs
+++ b/EnvelopeGenerator.Application/Common/Extensions/TaskExtensions.cs
@@ -74,22 +74,19 @@ public static class TaskExtensions
     /// <param name="task"></param>
     /// <param name="factory"></param>
     /// <returns></returns>
-    [Obsolete("Implement Mediator behaviors in the Osolete .NET project.")]
-    public static Task<T?> FirstAsync<T, TException>(this Task<IEnumerable<T>> task, Func<TException> factory) 
+    public static Task<T> FirstAsync<T, TException>(this Task<IEnumerable<T>> task, Func<TException> factory) 
         where TException : Exception 
-        => task.Then(t => t.FirstOrDefault()) ?? throw factory();
+        => task.Then(t => t.FirstOrDefault() ?? throw factory());
 }
 
 /// <summary>
 /// 
 /// </summary>
-[Obsolete("Implement Mediator behaviors in the Osolete .NET project.")]
 public static class Exceptions
 {
     /// <summary>
     /// 
     /// </summary>
-    [Obsolete("Implement Mediator behaviors in the Osolete .NET project.")]
     public static NotFoundException NotFound() => new();
 
     /// <summary>