Hi there,
Thank you for reaching out to us.
I would highly recommend going through the steps of running the Ad Manager API with one of our client libraries first, in order to ensure that all of the prerequisite authorization steps would have been completed prior to using Postman to do the same. In particular, you may want to do a check on the following aspects to see if you already possess the requisite files and/or have done the requisite steps:
This section might also help in troubleshooting your Postman setup. Kindly make sure that your HTTP queries are being properly authenticated with the correct access token, and are using the correct scope as well.
 |
| Ziv Yves Sanchez |
| Ad Manager API Team |
|
|
| |

ref:_00D1U1174p._5004Q29SME5:ref