Can start a job from Postman but unable to start it from an external application using API

Dear all, I am using the community 2021.4 release. I have an unattended robot associated with a process. To trigger the process remotely, I have created a confidential external application and granted it several scopes like OR.Machines, OR.Robots, OR.Execute etc. at the application level. I am able to start a job using the Orchestrator API from Postman by making a series of calls - authenticate using client credentials, get releases, get folders, get robots and finally startjobs({url}/odata/Jobs/UiPath.Server.Configuration.OData.StartJobs).

Now I would like to start the job from an integration software e.g. Integromat and am following the same steps as in Postman i.e. get an access token and use it in the startjobs call. The details in the header and the request body are exactly same, e.g.
Header: Authorization, X-UIPATH-OrganizationUnitId
“startInfo”: {
“ReleaseKey”: “----”,
“RobotIds”: [000000],
“Strategy”: “Specific”,
“NoOfRobots”: 0
However, using Integromat I get a 400 response with a message “startJobParameters must not be null”. What am I missing? Thanks for looking into this issue.

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