このエラーメッセージに関する原因と対処に関して説明します。
エラーメッセージ(英語)：
cloudformation propagateatlaunch not found in properties
対処
関連リンク
Amazon EC2 Auto Scaling AutoScalingGroup TagProperty
https://docs.aws.amazon.com/ja_jp/AWSCloudFormation/latest/UserGuide/aws-properties-as-tags.html
Amazon EC2 Auto Scaling AutoScalingGroup TagProperty - AWS ...
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-as-tags.html
リソースタグ - AWS CloudFormation
https://docs.aws.amazon.com/ja_jp/AWSCloudFormation/latest/UserGuide/aws-properties-resource-tags.ht・・・
AWS Cloudformation failing to acknowledge AutoScalingGroup - Stack ...
https://stackoverflow.com/questions/42893876/aws-cloudformation-failing-to-acknowledge-autoscalinggr・・・
AWS CloudFormation template "Launch configuration name ...
https://stackoverflow.com/questions/46910120/aws-cloudformation-template-launch-configuration-name-n・・・
CloudFormation tags for instances created by LaunchConfig
https://stackoverflow.com/questions/46243804/cloudformation-tags-for-instances-created-by-launchconf・・・
Name an EC2 Instance in the CloudFormation template?
https://stackoverflow.com/questions/15260263/name-an-ec2-instance-in-the-cloudformation-template
How to name an Auto Scaling Group in a CloudFormation ...
https://stackoverflow.com/questions/30803757/how-to-name-an-auto-scaling-group-in-a-cloudformation-t・・・
amazon web services - Can't get CloudFormation AutoScalingGroup to ...
https://serverfault.com/questions/895262/cant-get-cloudformation-autoscalinggroup-to-work
widdix/aws-cf-templates - GitHub
https://github.com/widdix/aws-cf-templates/blob/master/ecs/cluster.yaml