Architect WFM API returning 401 during shift swap validation

Architect & Flows
1

Just noticed that our custom flow is hitting a 401 Unauthorized when calling the WFM schedule adherence endpoint to validate shift swaps. The token refresh logic seems fine, but the API rejects the request specifically during the Chicago morning rush. Here is the payload we are sending:

{
 "userId": "agent-12345",
 "timeRange": "2024-05-15T08:00:00-05:00/2024-05-15T16:00:00-05:00",
 "type": "shift_swap"
}

Any ideas why the auth fails only during high-volume swap periods?