Could not access Ads API with UNAUTHORIZED_ACCESS error



My application ID is 6957762.
I have received the email which shows the ads access has been approved for my APP.

I have tried to access the following API:
With header:
Authorization OAuth oauth_version=“1.0”, oauth_consumer_key=“xxx”, oauth_token=“xxx”, oauth_timestamp=“1500587019”, oauth_nonce=“xx”, oauth_signature_method=“HMAC-SHA1”, oauth_signature=“xx”

everything is fine. I could get a correct response:
my twitter account Id is :
“id”: 3082789737,
“id_str”: “3082789737”,

Then, I am trying to access the following ads api
with the same header
I get the following error:
“errors”: [
“message”: “This request is not properly authenticated”
“request”: {
“params”: {}

Please let me know if I miss anything here.
Any suggestions are welcome!

Guidance for UNAUTHORIZED_ACCESS issues

The oauth_signature cannot be the same for both calls. The signature is an encrypted string that includes the URL being called. I suspect that may be the issue. Have you tried twurl?


@SimplrConnector: This is very likely due to an issue with the oauth_signature. Please see this post for additional details.