SLS existing S3 lambda trigger

serverless.yml

functions:
  TriggerFunc:
    handler: handlers.main
  
resources:
  Resources:
  
    # Bucket 'TriggeredBucket'
    TriggeredBucket:
      Type: AWS::S3::Bucket
      DependsOn:
        - TriggerFuncLambdaPermissionTriggeredBucketS3
      Properties: 
        BucketName: my-unique-bucket-name
        NotificationConfiguration:
          LambdaConfigurations:
            - Event: s3:ObjectCreated:*
              Function:
                Fn::GetAtt:
                  - TriggerFuncLambdaFunction
                  - Arn
        CorsConfiguration:
          CorsRules:
            - AllowedHeaders:
                - "*"
              AllowedMethods:
                - PUT
              AllowedOrigins:
                - "*"
    
    # Lambda 'TriggerFunc' bucket permission
    TriggerFuncLambdaPermissionTriggeredBucketS3:
      Type: AWS::Lambda::Permission
      DependsOn:
        - TriggerFuncLambdaFunction
      Properties:
        FunctionName:
          Fn::GetAtt:
            - TriggerFuncLambdaFunction
            - Arn
        Action: lambda:InvokeFunction
        Principal: s3.amazonaws.com
        SourceArn: arn:aws:s3:::my-unique-bucket-name

Hi David, does this code still work for you? I've been dealing with errors trying to set this up for hours and I can't seem to find a solution. My setup is from what I can tell nearly identical to your code.

The error I get is fairly useless:
An error occurred: S3BucketContent - Unable to validate the following destination configurations (Service: Amazon S3; Status Code: 400; Error Code: InvalidArgument; Request ID: 90359047BABA63E7; S3 Extended Request ID: y8UhP9g6deB+EOjYAN7SOwAhU75CEXIFy8ivZNzgYg66hYEg0TB3h8qnYRjY3+VTHZ/pfPUW8jg=).

serverless.yml

functions:
  ContentCreate:
    handler: src/controllers/content.create

resources:
  Resources:
    S3BucketContent:
      Type: AWS::S3::Bucket
      DependsOn: ContentCreateLambdaPermissionContentS3
      Properties:
        AccessControl: Private
        BucketName: ${self:custom.content_bucket}
        CorsConfiguration:
          CorsRules:
            - AllowedOrigins:
                - '*'
              AllowedHeaders:
                - '*'
              AllowedMethods:
                - GET
                - PUT
        NotificationConfiguration:
          LambdaConfigurations:
            - Event: s3:ObjectCreated:*
              Function:
                Fn::GetAtt:
                - ContentCreateLambdaFunction
                - Arn
    ContentCreateLambdaPermissionContentS3:
      Type: AWS::Lambda::Permission
      DependsOn: ContentCreateLambdaFunction
      Properties:
        FunctionName:
          Fn::GetAtt:
          - ContentCreateLambdaFunction
          - Arn
        Principal: s3.amazonaws.com
        Action: lambda:InvokeFunction
        SourceAccount:
          Ref: AWS::AccountId
        SourceArn: arn:aws:s3:::{$self:custom.content_bucket}