NETWORK/VERIFY_META_NOT_FOUND
The connection flow is missing required verification metadata (token/address/etc.), so the client/server cannot authenticate the WebSocket connection.
Classification
Application code. The wire value and spelling remain the same in every language. A registered code does not establish that its feature is active in every deployment.
Handling
Check the transport and connection state. A timeout or broken response does not prove the server made no change. Reconcile state-changing operations before retrying; reconnect only according to the session policy.