fix(asb): fixs issue with : An item with the same key has already bee…

…n added. Key: ReplyTo #2698

src/Paramore.Brighter.MessagingGateway.AzureServiceBus/ASBConstants.cs

@@ -8,6 +8,6 @@ internal static class ASBConstants
         public const string ReplyToHeaderBagKey = "ReplyTo";
 
         public static readonly string[] ReservedHeaders =
-            new[] {LockTokenHeaderBagKey, MessageTypeHeaderBagKey, HandledCountHeaderBagKey};
+            new[] {LockTokenHeaderBagKey, MessageTypeHeaderBagKey, HandledCountHeaderBagKey, ReplyToHeaderBagKey };
     }
 }