getting unexpected request

[Akshay G S]

POST

API :https://xxxxx.atlassian.net/rest/servicedeskapi/request

Json BODY

{
"requestParticipants": [
"qm:a713c8ea-1075-4e30-9d96-891a7d181739:5ad6d69abfa3980ce712caae"
],

"serviceDeskId": "4",
"requestTypeId": "25",
"requestFieldValues": {
"summary": "Request JSD help via REST",
"description": "I need a new *mouse* for my Mac"
}
}

response body

{
"errorMessage": "Cannot find issue",
"i18nErrorMessage": {
"i18nKey": "sd.portal.error.issue.not.found",
"parameters": []
}
}

what is going wrong while creating the Service desk request?

pls help