Getting 1006 Abnormal Closure errors immediately after the WebSocket handshake succeeds on Genesys Cloud BYOC Edge 24.1.0 in Asia/Singapore. Running JMeter 5.6.2 with just 5 threads targeting the wss://api.mypurecloud.com endpoint for concurrent call setup. The connection drops before any media packets are exchanged, and standard retry logic fails. Is there a specific header requirement for the WebSocket upgrade request in this edge configuration?