diff --git a/.github/workflows/ReleaseNotes.md b/.github/workflows/ReleaseNotes.md
index 4d23c932..b6c54605 100644
--- a/.github/workflows/ReleaseNotes.md
+++ b/.github/workflows/ReleaseNotes.md
@@ -1,3 +1,4 @@
 * [Server] Fixed not working _UpdateRetainedMessageAsync_ public api (#1858, thanks to @kimdiego2098).
 * [Client] Added support for custom CA chain validation (#1851, thanks to @rido-min).
-* [Client] Fixed handling of unobserved tasks exceptions (#1871).
\ No newline at end of file
+* [Client] Fixed handling of unobserved tasks exceptions (#1871).
+* [Client] Fixed not specified ReasonCode when using _SendExtendedAuthenticationExchangeDataAsync_ (#1882, thanks to @rido-min).
\ No newline at end of file
diff --git a/Source/MQTTnet/Client/MqttClient.cs b/Source/MQTTnet/Client/MqttClient.cs
index ced5739f..52c5cb8c 100644
--- a/Source/MQTTnet/Client/MqttClient.cs
+++ b/Source/MQTTnet/Client/MqttClient.cs
@@ -309,6 +309,7 @@ namespace MQTTnet.Client
                 AuthenticationMethod = Options.AuthenticationMethod,
                 AuthenticationData = data.AuthenticationData,
                 ReasonString = data.ReasonString,
+                ReasonCode = data.ReasonCode,
                 UserProperties = data.UserProperties
             };