Help in setting up a Lambda in Account A to be Invoked and use a Custom Resource Service Token in Account B Using CloudFormation

Question

Pls help I have a Lambda function in Account A that I need to use as a service token for a custom resource in Account B.

Pleas help with a Cloudformation Setup

Below is my Setup

**Account A Resource**

```
Resources:
  MyLambdaFunction:
    Type: AWS::Lambda::Function
    Properties:
      FunctionName: MyLambdaFunction
      Handler: index.handler
      Role: arn:aws:iam:::role/LambdaExecutionRole
      Code:
        S3Bucket: my-bucket
        S3Key: my-lambda-code.zip
      Runtime: python3.8
      Timeout: 60
```

**Account B Resource**

```
Resources:
  MyCustomResource:
    Type: "Custom::MyCustomResource"
    Properties:
      ServiceToken: "arn:aws:lambda:AccountA:region:function:MyLambdaFunction"
```

Didier_Durand · Accepted Answer

Hi,

Please, follow precisely the guidance of this Knowledge Center article: https://repost.aws/knowledge-center/cloudformation-lambda-custom-resource

It is the solution for what you're trying to achieve via your CloudFormation templates.

Best,

Didier

Help in setting up a Lambda in Account A to be Invoked and use a Custom Resource Service Token in Account B Using CloudFormation

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