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Hi,
I'm not familiar with CloudFormation, but where does CF find the variable Stage ?
=> [ 'S3BucketMap', { Ref: 'Stage' } ,"s3BucketArn" ]
answered 3 years ago
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asked 4 years ago
- AWS OFFICIALUpdated 3 months ago

Is there an additional section where you define the Stage parameter? It also appears that you are using JSON syntax for the Resource value while the overall document is YAML. Check the examples here: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/mappings-section-structure.html#mappings-section-structure-examples