Exception:

"category": "NO_CATEGORY",
"context": [],
"eventType": "SCV_RESPONSE_ERROR",
"level": "error"
"code": "ERR_BAD_REQUEST"
"message": "Request failed with status code 400",
"name": "AxiosError",
"status": 400

Request failed with status code 400 Salesforce Service Cloud Voice Exception occurs when the Omni-Flow is invoked from Amazon Connect without proper configuration.

1. Make sure the Queues used in the Salesforce Omni-Channel Flow are mapped under Queue Mapping in the Contact Center.

2. Make sure Contact Center Channels have an entry for the Phone Number and Omni-Channel Flow.