Setting up Own MQTT broker (using Mosquitto) - not authorized to perform: iot:CreatePolicy

I am setting own mqtt broker using aws workshop: https://catalog.us-east-1.prod.workshops.aws/workshops/5ecc2416-f956-4273-b729-d0d30556013f/en-US/chapter6-mqtt-broker/10-step1

In startup.sh script execution step getting errors:

1. not authorized to perform: iot:CreatePolicy
2. not authorized to perform: iot:CreateKeysAndCertificate

User account having all below access permissions: IAMFullAccess AmazonS3FullAccess AWSIoTFullAccess AWSGreengrassFullAccess GreengrassV2TokenExchangeRoleAcess AdministratorAccess

I am trying to resolve this couple of days, but not yet succeeded . It very urgent need resolve for current project