diff --git a/packages/stream_chat_flutter/CHANGELOG.md b/packages/stream_chat_flutter/CHANGELOG.md
index f19972b4..d68549e1 100644
--- a/packages/stream_chat_flutter/CHANGELOG.md
+++ b/packages/stream_chat_flutter/CHANGELOG.md
@@ -1,3 +1,9 @@
+## Upcoming
+
+🐞 Fixed
+
+- [[#888]](https://github.com/GetStream/stream-chat-flutter/issues/888) Fix `unban` command not working in `MessageInput`.
+
 ## 3.4.0
 - Updated `stream_chat_flutter_core` dependency to [`3.4.0`](https://pub.dev/packages/stream_chat_flutter_core/changelog).
 
diff --git a/packages/stream_chat_flutter/lib/src/message_input.dart b/packages/stream_chat_flutter/lib/src/message_input.dart
index 8672f180..d1a45786 100644
--- a/packages/stream_chat_flutter/lib/src/message_input.dart
+++ b/packages/stream_chat_flutter/lib/src/message_input.dart
@@ -1816,6 +1816,8 @@ class MessageInputState extends State<MessageInput> {
 
     _mentionedUsers.clear();
 
+    message = _replaceUserNameWithId(message);
+
     try {
       Future sendingFuture;
       if (widget.editMessage == null ||
@@ -2081,3 +2083,21 @@ class _CountdownButton extends StatelessWidget {
         ),
       );
 }
+
+Message _replaceUserNameWithId(Message message) {
+  final mentionedUsers = message.mentionedUsers;
+  if (mentionedUsers.isEmpty) return message;
+
+  var messageTextToSend = message.text;
+  if (messageTextToSend == null) return message;
+
+  for (final user in mentionedUsers.toSet()) {
+    final userName = user.name;
+    messageTextToSend = messageTextToSend!.replaceAll(
+      '@$userName',
+      '@${user.id}',
+    );
+  }
+
+  return message.copyWith(text: messageTextToSend);
+}
diff --git a/packages/stream_chat_flutter/lib/src/message_text.dart b/packages/stream_chat_flutter/lib/src/message_text.dart
index bb2946f4..4787bb9e 100644
--- a/packages/stream_chat_flutter/lib/src/message_text.dart
+++ b/packages/stream_chat_flutter/lib/src/message_text.dart
@@ -84,9 +84,10 @@ class MessageText extends StatelessWidget {
   String _replaceMentions(String text) {
     var messageTextToRender = text;
     for (final user in message.mentionedUsers.toSet()) {
+      final userId = user.id;
       final userName = user.name;
       messageTextToRender = messageTextToRender.replaceAll(
-        '@$userName',
+        '@$userId',
         '[@$userName](@${userName.replaceAll(' ', '')})',
       );
     }