HIU /v0.5/subscription-requests/cm/init not getting on-init callback

I am calling the ```
https://dev.abdm.gov.in/gateway/v0.5/subscription-requests/cm/init
API
https://dev.abdm.gov.in/gateway/v0.5/subscription-requests/cm/init Headers : {Authorization=Bearer <auth_token>, content-type=application/json, X-CM-ID=sbx, accept=/} Payload: {
“requestId” : “0bb03404-16a2-47a7-bd4c-02d553b5fc90”,
“timestamp” : “2023-12-03T10:34:01.588Z”,
“subscription” : {
“purpose” : {
“text” : “test”,
“code” : “string”,
“refUri” : “string”
},
“patient” : {
“id” : “<my_id>@sbx”
},
“hiu” : {
“id” : “ehrn_mar16_hiu”
},
“hips” : [ {
“id” : “ehrn_aug31_hip”
} ],
“categories” : [ “LINK” ],
“period” : {
“from” : “2023-12-02T17:19:29.588Z”,
“to” : “2023-12-22T17:19:29.588Z”
}
}
}
RESPONSE FROM GATEWAY : HttpResponse{result=202, response=}

In the on-init callback, I am getting this error

“uri”:"/v0.5/subscription-requests/hiu/on-init",“headers”:{“content-type”:“application/json”,“accept”:"/",“correlation-id”:“ccfcc505-66ca-4999-90cc-9e94d74cb2ab”,“content-length”:“331”,“user-agent”:“ReactorNetty/0.9.7.RELEASE”,“authorization”:“REDACTED”,“host”:“dev.abdmc.healthekare.com”,“uber-trace-id”:“a40b0af4120a11e4:23232385c402bc66:684807db0ae0fae:1”,“x-hiu-id”:“bridge_HEALTHVEN_473091”},“url”:“https://dev.abdmc.healthekare.com:8443/v0.5/subscription-requests/hiu/on-init",“body”:"{“requestId”:“66ac0016-b5d5-418f-81cd-de6d4dbbb5ca”,“error”:{“code”:2500,“message”:“Error in making call to target system Content type ‘text/plain’ not supported for bodyType=in.projecteka.gateway.clients.model.CmErrorResponse”},“timestamp”:[2023,12,3,10,34,3,672409000],“resp”:{“requestId”:“0bb03404-16a2-47a7-bd4c-02d553b5fc90”}}”,“method”:“POST”,“size”:2139,“querystring”:{}}