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Check that you are using the same clientid
for the connection and the same topics to publish and subscribe. The certificate is associated to an AWS IoT Policy which is scoped down to some specific permission, including which clientId is allowed to connect and which topics the client can publish and subscribe to.
You can find more information about IoT Policies in the documentation.
https://docs.aws.amazon.com/iot/latest/developerguide/iot-policies.html
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