Seeed 1-Click IoT button for AWS : Switch from AWS 1-Click to AWS IoT Core

Hi,

I have a Seeed 1-Click IoT button for AWS whick works well with “AWS 1-Click IoT” Service.
But the “AWS 1-Click IoT” service is closing at the end of the year.
The replacement service is “AWS IoT Core”.

Does someone know how to register a Seeed 1-Click IoT button for AWS in the “AWS IoT Core”?
It asks to transfer a certificate (and a python/nodejs/java sdk) on the device and I don’t know how to transfer files on it. There is a method with DSN number declaration but the number at the back of my device is not recognized.

If using this device with IoT Core is not possible, does someone know if there are similar devices which work with IoT Core?