GCP Add IAM Role to Service Account by Ulysses · Sep 22, 2019 Here’s how to add an IAM role to a GCP Service Account. gcloud projects add-iam-policy-binding your-project-id \ --member serviceAccount:service-account-name@your-project-id.iam.gserviceaccount.com \ --role roles/storage.objectAdmingcloud projects add-iam-policy-binding your-project-id \ --member serviceAccount:service-account-name@your-project-id.iam.gserviceaccount.com \ --role roles/storage.objectAdmin