Getting Access Denied for on-discover API(https://dev.abdm.gov.in/gateway/v0.5/care-contexts/on-discover)

I am trying to push callback request to https://dev.abdm.gov.in/gateway/v0.5/care-contexts/on-discover. But iam getting 403(Forbidden) error.

Discover Request Receive from Mobile App:
{“requestId”:“97f67d4c-9f0e-46da-afc8-dab23e107e42”,“timestamp”:“2022-08-01T06:59:41.571697”,“transactionId”:“586c667b-d0fa-423b-b681-3cbb1c9fee57”,“patient”:{“id”:“91735176185842@sbx”,“verifiedIdentifiers”:[{“type”:“MOBILE”,“value”:"+91-9492204836"},{“type”:“NDHM_HEALTH_NUMBER”,“value”:“91-7351-7618-5842”},{“type”:“HEALTH_ID”,“value”:“91735176185842@sbx”}],“unverifiedIdentifiers”:[],“name”:“PRAMOD KAMIREDDY”,“gender”:“M”,“yearOfBirth”:“1987”}}

Discover Response Return/Send to NDHM :
{“requestId”:“69ac93b9-c03e-4815-b91a-9a2002b3d436”,“timestamp”:“2022-08-01T06:55:40.40”,“transactionId”:“586c667b-d0fa-423b-b681-3cbb1c9fee57”,“patient”:{“referenceNumber”:“91735176185842@sbx”,“display”:“PRAMOD KAMIREDDY”,“careContexts”:[{“referenceNumber”:“ESIC-0001”,“display”:“ESICOPD”},{“referenceNumber”:“ESIC-0005”,“display”:“NCD”}],“matchedBy”:[“MR”]},“error”:null,“resp”:{“requestId”:“97f67d4c-9f0e-46da-afc8-dab23e107e42”}}

Can you help what is going wrong.