Update CloudFormation template with the following deletion policy:

AWSTemplateFormatVersion: '2010-05-09'

Resources:

appUser:

Type: AWS::IAM::User

DeletionPolicy: Retain

Update CloudFormation template with the following deletion policy:

AWSTemplateFormatVersion: '2010-09-09'

Resources:

appUser:

Type: AWS::IAM::User

DeletionPolicy: RetainExceptOnCreate

Update the CloudFormation service role to include the following policy:

{

"Version": "2012-10-17",

"Statement": [{

"Effect": "Allow",

"Action": ["cloudformation:UpdateTerminationProtection"],

"Resource": "*"

}]

}

Update the stack policy to include the following statements:

{

"Statement": [{

"Effect": "Deny",

"Action": "Update:*",

"Principal": "*",

"Resource": "*",

"Condition": {

"StringEquals": {

"ResourceType": "AWS::IAM::User"

}

}

}]

}