doc: Document unable to access device err

doc/content/devices/troubleshooting/_index.md

@@ -58,6 +58,10 @@ curl -X DELETE 'https://thethings.example.com/api/v3/<js/ns/as>/applications/<ap
 
 Next, recreate your device as documented in the [Using the API]({{< ref "/the-things-stack/interact/api/#multi-step-actions" >}}) section.
 
+## I see "Unable to access the end device" error
+
+If you're facing this error, your end device has probably been configured with an incorrect server address, so {{% tts %}} Console treats and shows it as in `Other cluster`. To regain access to your end device, you should configure it with the correct server address. That can be done by accessing device's **General settings** and configuring server address, or by deleting and recreating the end device with an appropriate server address.
+
 ## How do I see device events?
 
 Device event logs can be found in the console in the device's general information page. See [Working with Events]({{< ref "the-things-stack/management/events" >}}) for other ways of subscribing to events.