Hi @jansi rani krishnan ,
as I wrote before: The Return Data
activity is used to return the related data to the Invoke Runbook
activity.
I am not sure if Postman can handle this.
Maybe you have to return the IncidentID to SNOW inside your PowerShell script calling SNOW and return the IncidentID using the corresponding ID of the SNOW object.
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Regards
Andreas Baumgarten