Deploys in ap-southeast-4 fail with transform error

[J-tt]

Describe the bug
Deploying to ap-southeast-4 fails with:

Fragment returned by transform AWS::Serverless-2016-10-31 is null. Rollback requested by user.

Steps To Reproduce
Steps to reproduce the behavior:

1. Follow the quick start guide in the readme (create config.json and deploy it via CLI to ap-southeast-4), or run this command:

aws cloudformation create-stack \
  --region ap-southeast-4 \
  --output text \
  --stack-name buildkite \
  --template-url "https://s3.amazonaws.com/buildkite-aws-stack/v6.28.0/aws-stack.yml" \
  --capabilities CAPABILITY_IAM CAPABILITY_NAMED_IAM CAPABILITY_AUTO_EXPAND \
  --parameters "[{\"ParameterKey\":\"BuildkiteAgentToken\",\"ParameterValue\":\"TokenGoesHere\"},{\"ParameterKey\":\"KeyName\",\"ParameterValue\":\"default\"},{\"ParameterKey\":\"ImageId\",\"ParameterValue\":\"\"}]"

2. Navigate to the CloudFormation dashboard
3. Deploy fails with above error

Expected behavior
Deployment succeeds

Actual behaviour
Deployment failed: "ROLLBACK_COMPLETE":

Fragment returned by transform AWS::Serverless-2016-10-31 is null. Rollback requested by user.

Stack parameters (please complete the following information):

• AWS Region: ap-southeast-4
• Version: latest (6.30.0)

Additional context
Not sure what resources are missing in ap-southeast-4 that causes this issue, quite unfamiliar with CloudFormation templates.

[DrJosh9000]

Thanks @J-tt, that's annoying. This is the first we've heard of this. It seems maybe that AWS::Serverless-2016-10-31 transform might not be functioning in ap-southeast-4. This could be because it is not fully supported there, or one of the services it interacts with. Have you raised this in a ticket with AWS?

[J-tt]

Hi @DrJosh9000 I haven't raised it with AWS, as I'm not 100% sure what the root cause is.

I'll look at filing this issue over at https://github.com/aws/serverless-application-model as well