Fabric API generate token using client_credentials

Question

I am trying to generate token using this method but in Postman: 
Access Token using grant_type = client_credentials (Recommended).
POST 'https://api.equinix.com/oauth2/v1/token' -H "content-type: application/json" -d '{ "grant_type": "client_credentials", "client_id": "******", "client_secret": "****" }'
I have the body set as specified in the link: https://developer.equinix.com/docs?page=/dev-docs/fabric/overview but when I execute the query I get this error:
{
    "errorDomain": "apps-fqa",
    "errorTitle": "Unable to Process the Request",
    "errorCode": "S1002",
    "developerMessage": "Failed to execute the ExtractVariables: extractjsonparams",
    "errorMessage": "Unable to Process the Request, Please try again later."
}
I have a client_id and client_sercret generated and have tested it with Terraform. What am I missing?Thanks!

API_User · Accepted Answer

Got it, used wrong credentials

access_token=`curl -s --request POST \ 
--url https://${endpoint_url}/oauth2/v1/token \ 
--header 'accept: application/json' \ 
--header 'content-type: application/json' \ 
--data '{"client_id":"'${client_id}'","client_secret":"'${client_secret}'","grant_type":"client_credentials"}' \ 
| jq -r '.access_token'`

API_User · Answer

I have this problem also.The oauth2/v1 API worked since year ago, but there are many updates on the API.https://developer.equinix.com/catalog/fabricv4 shows only bearer auth without any example on how to get a bearer token.

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