update

packages/react/src/modules/slack/components/SlackChannelCombobox/SlackChannelCombobox.tsx

@@ -88,12 +88,13 @@ export const SlackChannelCombobox = ({
     // There are cases where a channel is "connected" in Knock, but it wouldn't be
     // posting to it if the channel is private and the Slackbot doesn't belong to it,
     // so the channel won't show up here and it won't be posted to.
-    const channels =
-      connectedChannels?.filter((connectedChannel) => {
-        return !!slackChannels.find(
-          (slackChannel) => slackChannel.id === connectedChannel.channel_id,
-        );
-      }) || [];
+    const slackChannelsMap = new Map(
+      slackChannels.map((channel) => [channel.id, channel]),
+    );
+
+    const channels = connectedChannels?.filter((connectedChannel) => {
+      return slackChannelsMap.has(connectedChannel.channel_id);
+    }) || [];
 
     setCurrentConnectedChannels(channels);
   }, [connectedChannels, slackChannels]);