AWS Keys in a BC66

I have a bunch of BC66 board and I can communicate with AWS IOT/ MQTT but I found out that I can not have the same key for every board, or the message gets dropped when 2 boards try and communicate at the same time. If I was going to make thousands of boards how can I go about setting each key for AWS. Can the software be set in the factory?

I don’t think there should be only one way for AWS platform keys of authentication and authentication; and I also suggest you ask if AWS supports authentication keys for the same model of device.At present, large cloud platforms in China, such as Ali Cloud, can support the same key for the same type of devices.