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Hi. How does your device get the data endpoint? Unless you are using a custom domain, you would also need to change the endpoint on the device. Have you done that? Sounds like it may still be trying to connect to the old account.
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Hi Greg. Thank you for your quick response! Indeed device was trying to connect to the old accounts endpoint, after modifying files that contain endpoint on device through wired connection, it was working as we wanted. But our main issue is that we have a fleet of devices , that are not locally available, so we are trying to change all credentials through AWS IoT Console. So we were searching for a way to transfer IoT devices to new AWS account without re-flashing them or changing their files.
Hi. You can transfer certificates, or you can copy certificates to the new account (using DescribeCertificate, then RegisterCertificate or RegisterCertificateWithoutCA API operations: https://docs.aws.amazon.com/iot/latest/apireference/API_Operations_AWS_IoT.html). However you must also reconfigure/reprogram the devices with the new endpoint, else they won't connect to the new account.