`AWS::ImageBuilder::Image` creation failed by "Can't start SSM Automation" "Rate exceeded" error

[goldeneggg]

Problem

I tried to create a AWS::ImageBuilder::Image resource. But I got the error as follows.

Error occurred during operation 'Can't start SSM Automation for arn MY_IMAGERECIPE_ARN during building. Rate exceeded'."

I do not know what exactly the "Rate exceeded" error refers to. In addition, I do not know how to avoid this error.

My Questions

1. According to this API document, the cause of the "Rate exceeded" error is The number of managed nodes targeted by the command exceeded the account limit for pending invocations., but when I check the Systems Manager Console for my current managed nodes, none exist. So I am confused as to the root cause. Is it possible to work around this error?
2. According to this "managed-nodes" document, The standard-instances tier allows you to register a maximum of 1,000 machines per AWS account per AWS Region.. Where can I find the remaining count available to me?

Thank you!