CXone Reporting API: Agent state history last 24h

Hey folks, trying to pull agent state history for the last 24 hours using the CXone Reporting API v2. I’ve got the OData query built, but it’s returning a 400 Bad Request. Not sure if I’m formatting the timestamp filter wrong. Here’s the snippet: GET /api/v2/reporting/agents/{agentId}/states?filter=start_time ge 2023-10-27T00:00:00Z. What am I missing?