Internal Server Error: OracleContext missing required property 'oic.service-instance

We are getting this error in OIC Gen3 when customer invoke to REST service.

curl -L 'https://OIC URL '
-H 'Content-Type: application/json'
-H 'x-b3-flags: 0'
-H 'x-b3-parentspanid: 0'
-H 'x-b3-traceid: 9cc8bf7f-facf-40b9-9b11-6e892573f6e3'
-H 'x-b3-spanid: -23424'
-H 'Authorization: Bearer ****'
-d '{"level":"C","timestamp":{"value":"2025-06-17T19:09:00.624+08:00"}}'

response error:

{    "message": "Internal Server Error",    "_embedded": {        "errors": [            {                "message": "Internal Server Error: OracleContext missing required property 'oic.service-instance'"            }        ]    },    "_links": {        "self": {            "href": "/ic/api/integration/v2/flows/rest/project/****",            "templated": false        }    }}

any insight how to OracleContext missing required property 'oic.service-instance