Error: Client error: `POST https://www.googleapis.com/oauth2/v4/token` resulted in a `401 Unauthorized` response:

[idg.u...@gmail.com]

I am getting a below error when trying to call a service

Error: Client error: POST https://www.googleapis.com/oauth2/v4/token resulted in a 401 Unauthorizedresponse:
{
"error": "unauthorized_client",
"error_description": "Client is unauthorized to retrieve access tokens using this me (truncated...)
....
.....
}

Can you let me know what I am doing wrong here

[Vincent Racaza (AdWords API Team)]

Hi,

To further investigate this, could you provide the authentication type that you are using as well as the client library? Also, please double check on your end if you have followed all the steps from our OAuth2 guide.

Thanks,

Vincent

AdWords API Team

[Vincent Racaza (AdWords API Team)]

Hi,

A gentle follow up on this. If you are still facing this issue, kindly provide the details that I asked in my previous reply.