sandbox api: "Error in getting user's profile"

I requested a bearer token ... no problem.

As I try to get the userport with that valid bearer token, I get an error. Did I miss something ?

Do I need an extra acceptance from our account manager to use my account in the sandbox ?

my curl request:

curl -ki --request GET \ 
  --url https://sandboxapi.equinix.com/ecx/v3/port/userport \ 
  --header 'accept: application/json' \ 
  --header 'authorization: Bearer ' \ 
  --header 'content-type: application/json'

the http response:

HTTP/1.1 500 Internal Server Error

with this error body:

{"errorCode":"IC-USR-014-01","errorMessage":"Error in getting user's profile"}