API query- how to construct

Hi,

I have an API based import to Zoho Analytics from an external source. I've been able to get a query working for the /users API endpoint, and I have a working query for the /devices API endpoint-

- but I cannot get the query to work in Zoho Analytics

here is the working query from Postman

Request Headers

Content-Type: application/json

accesstoken: MyAPIToken

Authorization: Basic WU9VUi1FTUFJTBBU1NXT1JE

User-Agent: PostmanRuntime/7.28.4

Accept: */*

Cache-Control: no-cache

Postman-Token: 883c8278-7cc3-468a-8086-6fdb1fac9822

Host: businessapi.mosyle.com

Accept-Encoding: gzip, deflate, br

Connection: keep-alive

▶Request Body

{ "operation": "list", "options": { "os": "mac" } }

And here is a pic of the (non working) request in Zoho Analytics

- the error response is 'HTTP 400' but I can't see any other info