diff --git a/blueprints/fedramp-high/app-engine/README.md b/blueprints/fedramp-high/app-engine/README.md
index 7342bfa1d..58812d1d8 100644
--- a/blueprints/fedramp-high/app-engine/README.md
+++ b/blueprints/fedramp-high/app-engine/README.md
@@ -37,6 +37,38 @@ You should see this README and some terraform files.
 Use the GCP consule to verify if the resources have been created. 
 
 ```To verify the creation of Instance classes: Go to Instances in your landing project``` <br />
+
+## Deployer Permissions
+
+The service account or identity deploying this blueprint requires the following roles:
+- **Workload Project (`main_project_id`):**
+  - `roles/appengine.appCreator` or `roles/appengine.appAdmin`
+  - `roles/serviceusage.serviceUsageAdmin`
+
+### Impersonated Deployment Configuration
+
+When deploying through service account impersonation, the Terraform `google` and `google-beta` providers must specify `user_project_override = true` and `billing_project` set to the workload project. Without this setting, provider-level quota and API enablement checks resolve against the deploying service account's project rather than the target workload project, leading to false `SERVICE_DISABLED` errors.
+
+Example provider configuration:
+
+```hcl
+provider "google" {
+  project                     = "<workload-project-id>"
+  region                      = "<region>"
+  impersonate_service_account = "<deployer-sa>@<iac-project-id>.iam.gserviceaccount.com"
+  user_project_override       = true
+  billing_project             = "<workload-project-id>"
+}
+
+provider "google-beta" {
+  project                     = "<workload-project-id>"
+  region                      = "<region>"
+  impersonate_service_account = "<deployer-sa>@<iac-project-id>.iam.gserviceaccount.com"
+  user_project_override       = true
+  billing_project             = "<workload-project-id>"
+}
+```
+
 <!-- BEGIN TFDOC -->
 ## Variables
 
diff --git a/blueprints/il5/postgresql/README.md b/blueprints/il5/postgresql/README.md
index 7ecc85c20..b18cd7dfb 100644
--- a/blueprints/il5/postgresql/README.md
+++ b/blueprints/il5/postgresql/README.md
@@ -17,8 +17,42 @@ limitations under the License.
 1. Copy terraform.tfvars.sample to terraform.tfvars
 1. Updated terraform.tfvars
 
-## Notes
-1. This blueprint consumes the shared `cloudsql-instance` module and attaches to an existing Private Service Access (PSA) connection via `psa_config.private_network`. It does not create or manage the underlying IP address reservation or VPC peering connection.
+## Deployer Permissions
+
+The service account or identity deploying this blueprint requires the following roles:
+- **Workload Project (`main_project_id`):**
+  - `roles/cloudsql.admin`
+  - `roles/serviceusage.serviceUsageAdmin`
+- **Network Host Project (`network_project_id`):**
+  - `roles/compute.networkUser`
+  - `roles/compute.securityAdmin` (for managing the firewall rule)
+- **KMS Project / Key (`kms_key_name`):**
+  - `roles/cloudkms.cryptoKeyEncrypterDecrypter`
+
+### Impersonated Deployment Configuration
+
+When deploying through service account impersonation, the Terraform `google` and `google-beta` providers must specify `user_project_override = true` and `billing_project` set to the workload project. Without this setting, provider-level quota and API enablement checks resolve against the deploying service account's project rather than the target workload project, leading to false `SERVICE_DISABLED` errors.
+
+Example provider configuration:
+
+```hcl
+provider "google" {
+  project                     = "<workload-project-id>"
+  region                      = "<region>"
+  impersonate_service_account = "<deployer-sa>@<iac-project-id>.iam.gserviceaccount.com"
+  user_project_override       = true
+  billing_project             = "<workload-project-id>"
+}
+
+provider "google-beta" {
+  project                     = "<workload-project-id>"
+  region                      = "<region>"
+  impersonate_service_account = "<deployer-sa>@<iac-project-id>.iam.gserviceaccount.com"
+  user_project_override       = true
+  billing_project             = "<workload-project-id>"
+}
+```
+
 <!-- BEGIN TFDOC -->
 ## Variables
 
diff --git a/fast/stages-aw/0-bootstrap/data/custom-org-policies/platform_policy.yaml b/fast/stages-aw/0-bootstrap/data/custom-org-policies/platform_policy.yaml
index 8252a2bf9..972f06110 100644
--- a/fast/stages-aw/0-bootstrap/data/custom-org-policies/platform_policy.yaml
+++ b/fast/stages-aw/0-bootstrap/data/custom-org-policies/platform_policy.yaml
@@ -98,6 +98,7 @@ iam.allowedPolicyMemberDomains:
 essentialcontacts.managed.allowedContactDomains:
   rules:
   - enforce: true
+    parameters: '{"allowedDomains":["@${domain_name}"]}'
 
 
 %{ if !contains(["FEDRAMP_MODERATE"], regime) ~}