Add 5712

Author: dominicbetts

articles/iot-operations/troubleshoot/known-issues.md

@@ -171,6 +171,22 @@ To work around this issue, complete the following steps to manually delete the C
 
 1. Uninstall Helm release without running the hook: `helm uninstall aio-<id>-connectors -n azure-iot-operations --no-hooks`
 
+### Media devices with an "_" character in the endpoint name are ignored
+
+---
+
+Issue ID: 5712
+
+---
+
+N/A
+
+---
+
+If you create a media device with an endpoint name that contains an underscore ("_") character, the connector for media ignores the device.
+
+To work around this issue, use a hyphen ("-") instead of an underscore in the endpoint name.
+
 ## Data flows issues
 
 This section lists current known issues for data flows.