Genesys Cloud Notification API WebSocket subscription fails with 401

NICE CXone API & Integrations
1
  • Node.js 18.17
  • @genesys/cloud-node-client-sdk 1.54.0
  • US/Pacific

I cannot figure out why my WebSocket connection to /api/v2/analytics/events drops immediately.

const ws = new WebSocket('wss://api.mypurecloud.com/api/v2/analytics/events', {
 headers: { 'Authorization': `Bearer ${token}` }
});

Server returns 401 Unauthorized instantly. The same token works for REST calls. Is the Notification API requiring a different scope or handshake method?