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Hi. You can use one certificate for multiple devices, but it's an anti-pattern. It's best practice to have a unique certificate for every device. This limits blast radius to a single device if a device is compromised.
AWS has numerous methods of device provisioning that can help you provision devices at scale:
https://d1.awsstatic.com/whitepapers/device-manufacturing-provisioning.pdf
https://docs.aws.amazon.com/iot/latest/developerguide/iot-provision.html
Please review that material and we'd be more than happy to answer subsequent questions.
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