250002: Invalid Authentication Information
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I am having the same issue as another individual reported here.
With no UPS rates being returned, I found under UPS Live Rates > API Connection Status, the error: “250002: Invalid Authentication Information”.
I did a Revoke, Save Changes and then Authorize, but I was not able to resolve the error.
As a temporary measure, I changed the API type from OAuth – Rest API to API Access Key – XML API. Although it’s not officially supported any longer, it is reporting back rates.
I am using version 2.3.7.
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