Use this Policy Definition in IAM to create a Policy and attach to a role, to grant the relevant permissions to the AWS Lambda function

LambdaPolicyDefinition.json

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": [
        "cloudwatch:DescribeAlarms",
        "lambda:UpdateAlias",
        "lambda:GetAlias",
        "lambda:GetProvisionedConcurrencyConfig",
        "sns:Publish"
      ],
      "Resource": "*",
      "Effect": "Allow"
    },
    {
      "Action": [
        "s3:GetObject",
        "s3:GetObjectVersion"
      ],
      "Resource": "arn:aws:s3:::*/CodeDeploy/*",
      "Effect": "Allow"
    },
    {
      "Action": [
        "s3:GetObject",
        "s3:GetObjectVersion"
      ],
      "Resource": "*",
      "Condition": {
        "StringEquals": {
          "s3:ExistingObjectTag/UseWithCodeDeploy": "true"
        }
      },
      "Effect": "Allow"
    },
    {
      "Action": [
        "lambda:InvokeFunction"
      ],
      "Resource": "arn:aws:lambda:*:*:function:CodeDeployHook_*",
      "Effect": "Allow"
    },
    {
      "Action": [
        "codedeploy:Batch*",
        "codedeploy:CreateDeployment",
        "codedeploy:Get*",
        "codedeploy:List*",
        "codedeploy:RegisterApplicationRevision"
      ],
      "Effect": "Allow",
      "Resource": "*"
    },
    {
      "Sid": "CodeStarNotificationsReadWriteAccess",
      "Effect": "Allow",
      "Action": [
        "codestar-notifications:CreateNotificationRule",
        "codestar-notifications:DescribeNotificationRule",
        "codestar-notifications:UpdateNotificationRule",
        "codestar-notifications:Subscribe",
        "codestar-notifications:Unsubscribe"
      ],
      "Resource": "*",
      "Condition": {
        "StringLike": {
          "codestar-notifications:NotificationsForResource": "arn:aws:codedeploy:*"
        }
      }
    },
    {
      "Sid": "CodeStarNotificationsListAccess",
      "Effect": "Allow",
      "Action": [
        "codestar-notifications:ListNotificationRules",
        "codestar-notifications:ListTargets",
        "codestar-notifications:ListTagsforResource",
        "codestar-notifications:ListEventTypes"
      ],
      "Resource": "*"
    },
    {
      "Sid": "CodeStarNotificationsChatbotAccess",
      "Effect": "Allow",
      "Action": [
        "chatbot:DescribeSlackChannelConfigurations"
      ],
      "Resource": "*"
    },
    {
      "Sid": "SNSTopicListAccess",
      "Effect": "Allow",
      "Action": [
        "sns:ListTopics"
      ],
      "Resource": "*"
    },
    {
      "Effect": "Allow",
      "Action": "ec2:Describe*",
      "Resource": "*"
    },
    {
      "Effect": "Allow",
      "Action": "elasticloadbalancing:Describe*",
      "Resource": "*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "cloudwatch:ListMetrics",
        "cloudwatch:GetMetricStatistics",
        "cloudwatch:Describe*"
      ],
      "Resource": "*"
    },
    {
      "Effect": "Allow",
      "Action": "autoscaling:Describe*",
      "Resource": "*"
    },
    {
      "Action": [
        "logs:*"
      ],
      "Effect": "Allow",
      "Resource": "arn:aws:logs:*:*:*"
    },
    {
      "Action": [
        "codepipeline:PutJobSuccessResult",
        "codepipeline:PutJobFailureResult"
      ],
      "Effect": "Allow",
      "Resource": "*"
    }
  ]
}