AWS CloudFormation: implementing Nested Stacks and Cross-Stack Outputs Not Resolving
I've encountered a strange issue with I've been banging my head against this for hours. I'm experimenting with Can someone help me understand I recently switched to I'm working with an scenario with AWS CloudFormation where my nested stacks are failing to resolve outputs from a parent stack. In my main stack, I'm trying to pass an output value to a nested stack, but it's resulting in the following behavior: ``` ResourceHandlerError: "Failed to create resource. Invalid parameters provided." ``` The main stack's template looks something like this: ```yaml Resources: ParentBucket: Type: 'AWS::S3::Bucket' Properties: BucketName: my-app-bucket NestedStack: Type: 'AWS::CloudFormation::Stack' Properties: TemplateURL: https://s3.amazonaws.com/mybucket/nested-stack.yaml Parameters: BucketName: !Ref ParentBucket ``` And in my nested stack, I'm trying to access the `BucketName` parameter like this: ```yaml Parameters: BucketName: Type: String Resources: MyBucketPolicy: Type: 'AWS::S3::BucketPolicy' Properties: Bucket: !Ref BucketName PolicyDocument: Version: '2012-10-17' Statement: - Effect: Allow Principal: '*' Action: s3:GetObject Resource: !Sub 'arn:aws:s3:::${BucketName}/*' ``` I've verified that the URL for the nested stack template is correct, and I even checked the permissions on the S3 bucket where the nested stack template is stored. It’s public, and I can access it directly via browser. However, the deployment fails with the mentioned behavior message. I've also tried restructuring the way I pass parameters and ensured that the nested stack is properly defined in the parent stack. What am I missing here? Could anything in my parameter handling or output referencing be causing this? Any insights would be greatly appreciated! I'm coming from a different tech stack and learning Yaml. Any help would be greatly appreciated! For context: I'm using Yaml on macOS. Is there a better approach? Thanks for any help you can provide! My team is using Yaml for this application. Am I approaching this the right way?