Why does this config cause immediate registration failures? We migrated our softphone configuration from Zendesk Talk to Genesys Cloud using the standard WebRTC endpoint settings. The environment is EU-West. When agents launch the desktop, the console shows WebSocket connection failed: 401 Unauthorized on the /v2/webchat/webrtc endpoint. The JWT token appears valid, but the registration handshake drops. Our Zendesk setup didn’t require explicit TLS certificate pinning, yet GC seems stricter. Is there a specific header mismatch or a known issue with the current SDK version 9.0.100 that breaks the initial auth challenge?