Hi Koshish,

Ideally, the same credentials should work on all the three servers provided 
everything else (user making the call, account etc.,) is same on all the 
server. Could you please verify your credentials using the below cURL request 
and see if you are able to generate the access token? If your credentials are 
correct, you should be able to generate an access token for the below CURL 
request.

curl https://www.googleapis.com/oauth2/v4/token \
-d refresh_token=your-refresh_token \
-d client_id=your-client-id \
-d client_secret=your-client-secret \
-d grant_type=refresh_token

If your credentials are incorrect or still facing issue then you could try 
generating a new refresh token with the help of this guide and retry your 
request. If not, could you please share the complete request and response logs 
along with the client customer id and email address authenticating the call for 
me to investigate this further on my end?

P.S: Please use Reply privately to author option while sharing the details.

Regards,
Nikisha Patel, Google Ads API Team
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