diff --git a/integrations/mqtt/index.html b/integrations/mqtt/index.html
index ebd674af73..cda7c9839d 100644
--- a/integrations/mqtt/index.html
+++ b/integrations/mqtt/index.html
@@ -192,7 +192,9 @@ <h2 id="creating-an-api-key">Creating an API Key</h2>
 
 <div class="notification is-info is-light has-text-dark">
   <h5 class="title is-family-sans-serif has-text-dark mb-1">Note:</h5>
-  Make sure to copy your API key now, since it will no longer be visible after leaving the page for security reasons.
+  <p>Make sure to copy your API key now, since it will no longer be visible after leaving the page for security reasons.</p>
+<p>If API key does not exist or has been removed, you will probably see the <code>as.mqtt.connect.fail</code> event with the <code>api key with id {api_key_id} not found</code> error in application Live events.</p>
+
 </div>
 
 <p>Keep in mind that this example shows the MQTT Server information for The Things Stack Open Source. If you are using a different deployment, make sure your read a <a href="https://www.thethingsindustries.com/docs/integrations/mqtt/#note-on-using-the-tenant-id">Note on Using the tenant ID</a>.</p>
diff --git a/sitemap.xml b/sitemap.xml
index f827723935..c2585c7fb2 100644
--- a/sitemap.xml
+++ b/sitemap.xml
@@ -600,7 +600,7 @@
     <lastmod>2023-04-19T08:14:44+02:00</lastmod>
   </url><url>
     <loc>https://www.thethingsindustries.com/docs/integrations/mqtt/</loc>
-    <lastmod>2021-12-23T14:18:20+01:00</lastmod>
+    <lastmod>2024-05-18T21:07:32+05:30</lastmod>
   </url><url>
     <loc>https://www.thethingsindustries.com/docs/integrations/storage/retrieve/</loc>
     <lastmod>2024-03-04T15:43:05+01:00</lastmod>