Access to Transcript API

I am trying to connect to the transcript API to obtain KPIs and show them in a PowerBI dashboard. But I have problems connecting to the API. I have tried from Postman and also from https://developer.voiceflow.com/reference/fetchtranscripts web. I include the projectID an also de key obtain in the integration section. But I always receive this error:

{
"name": "verror",
"message": "Unauthorized",
"requestID": "833880"
}

Anyone has tried this before and could discover what I am doing wrong? Here is the code generated of the call:

curl --request GET \
--url https://api.voiceflow.com/v2/transcripts/66570e7ceXXXXXXXXXXX \
--header 'Authorization: Bearer VF.DM.66571e67ee998fXXXXXXXXXX.5KAnkEjXXXXXXXX' \
--header 'accept: application/json'

Thanks in advance!