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What does your Authorization header look like? Did you include the Bearer keyword prefix? (I have made that mistake and got stuck for a long time, once)
With that access token, I am trying to make call to apigee and it is failing with "keymanagement.service.invalid_access_token". Same access token being used in Postman and I am able to make successful call.
It sounds like you are making the call in two different ways. One way is postman, and it succeeds. And the other way... you haven't described. Can you characterize the other way you're making the calls that are failing?
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