How to run customized ssm document on config auto-remediation via CloudFormation?

Hi, I'm trying to run auto-remediation via config on multiple accounts. The ssm document I need doesn't exist in China regions, so I created a customized one.

I'm using CloudFormation to deploy the auto-remediation within AWS Config stackset. but I'm getting an error that the ssm_document_name is not valid.

"... ResourceType:AWS::Config::RemediationConfiguration, ResourceStatusReason:Could not find SSM document arn:aws-cn:ssm:cn-northwest-1:account#:documents/doc-name with version null (Service: AmazonConfig; Status Code: 400; Error Code: InvalidParameterValueException;)

(obviously, the "account#" and "doc-name" are replacing the real info)

What can be the reason?