I can't download the certificate(AWS IoT)

Sorry for the issue. I couldn't reproduce what you mentioned. I was able to create a certificate for a thing using the steps you described. If you are able to reproduce the issue, please tell us what region, and if possible any other details such as API request, responses (by going into browser's Inspector).

Hi Ryoto, yesterday we identified and corrected an issue with certificate downloading from the console in the Tokyo region. Please let us know if you are still encountering the issue.

Ryan

Thank you for your reply.
Now available for download in the Tokyo region.
It was helpful.
Ryoto