diff --git a/lib/discourse_chat/provider/slack/slack_command_controller.rb b/lib/discourse_chat/provider/slack/slack_command_controller.rb
index edecda7..4fc905a 100644
--- a/lib/discourse_chat/provider/slack/slack_command_controller.rb
+++ b/lib/discourse_chat/provider/slack/slack_command_controller.rb
@@ -28,6 +28,8 @@ module DiscourseChat::Provider::SlackProvider
         case params[:channel_name]
         when 'directmessage'
           "@#{params[:user_name]}"
+        when 'privategroup'
+          params[:channel_id]
         else
           "##{params[:channel_name]}"
         end
diff --git a/lib/discourse_chat/provider/slack/slack_provider.rb b/lib/discourse_chat/provider/slack/slack_provider.rb
index 419e4dd..82f5f5a 100644
--- a/lib/discourse_chat/provider/slack/slack_provider.rb
+++ b/lib/discourse_chat/provider/slack/slack_provider.rb
@@ -6,7 +6,7 @@ module DiscourseChat::Provider::SlackProvider
   PROVIDER_ENABLED_SETTING = :chat_integration_slack_enabled
 
   CHANNEL_PARAMETERS = [
-                        { key: "identifier", regex: '^[@#]\S*$', unique: true }
+                        { key: "identifier", regex: '^[@#]?\S*$', unique: true }
                        ]
 
   def self.excerpt(post, max_length = SiteSetting.chat_integration_slack_excerpt_length)