Invoke Lambda from within another Lambda

lambda_2_lambda.py

import json
import urllib
import boto3

lam = boto3.client('lambda')

def lambda_handler(event, context):
  payload = {}
  payload['key1'] = 'key1'
  payload['key2'] = 'key2'
  payload['key3'] = 'key3'
  
  try:
    response = lam.invoke(FunctionName='hello-world',
                  InvocationType='RequestResponse',
                  Payload=json.dumps(payload))
  except Exception as e:
    print(e)
    raise e
  print(response)

Ensure aws role has:

"Effect": "Allow",
"Action":["lambda:InvokeFunction"],
"Resources":["*"]