https://userapps.support.sap.com/sap/support/knowledge/en/2120237
2120237 - System dropdown list is empty in SAP IQ Cockpit - SAP IQ | SAP Knowledge Base Article
Start IQ Cockpit and open the home page https://cockpit_host:cockpit_port#/cockpit/ You may see an empty system dropdown list, or your IQ server may not appear...