Save Transcript API

Hi I am calling the following API ( https://developers.avayacloud.com/avaya-experience-platform/reference/savetranscript ) trying to save a transcript.

The URL I am sending the request to is: https://experience.api.avayacloud.com/api/digital/transcript/command/v1/accounts/MY_ACCOUNT_ID/engagements/33281129-d2a1-472d-984e-871d9e89a86f/dialogs/20373f90-d3fd-40b5-9ef4-cd16e2791657/transcripts where MY_ACCOUNT_ID is replaced with the actual account id. At first I was getting a 400 bad request error due to a typo I made, I am now getting a 403 Forbidden error response:

{
type: 'https://developers.avayacloud.com/onecloud-ccaas/docs/error-handling#forbidden',
title: 'Request Not Allowed.',
status: 403,
detail: 'Request Not Allowed',
instance: '/api/digital/transcript/command/v1/accounts/MY_ACCOUNT_ID/engagements/33281129-d2a1-472d-984e-871d9e89a86f/dialogs/20373f90-d3fd-40b5-9ef4-cd16e2791657/transcripts'
}

I know I am authenticating properly.....any idea on what could be the issue here?

Thanks!