diff --git a/infrastructure/global/stacksets/inf-org-crossaccount/test-cross-org.py b/infrastructure/global/stacksets/inf-org-crossaccount/test-cross-org.py
new file mode 100755
index 00000000..f9586017
--- /dev/null
+++ b/infrastructure/global/stacksets/inf-org-crossaccount/test-cross-org.py
@@ -0,0 +1,56 @@
+import boto3
+from botocore.exceptions import ClientError
+
+# --- SET THESE TO MATCH YOUR TERRAFORM ---
+CROSS_ACCOUNT_ROLE_NAME = "OrganizationAdminAccessRole" 
+TARGET_REGION = "us-east-1"
+
+def test_connectivity():
+    # 1. Initialize the Organizations client from Management Account
+    org_client = boto3.client('organizations')
+    sts_client = boto3.client('sts')
+    
+    print(f"Starting connectivity test using role: {CROSS_ACCOUNT_ROLE_NAME}\n")
+    print(f"{'Account Name':<25} | {'Account ID':<15} | {'Status'}")
+    print("-" * 55)
+
+    # 2. Page through all accounts in the Org
+    paginator = org_client.get_paginator('list_accounts')
+    for page in paginator.paginate():
+        for account in page['Accounts']:
+            # Skip accounts that aren't active (suspended/pending)
+            if account['State'] != 'ACTIVE':
+                continue
+
+            acc_id = account['Id']
+            acc_name = account['Name']
+            role_arn = f"arn:aws:iam::{acc_id}:role/{CROSS_ACCOUNT_ROLE_NAME}"
+
+            try:
+                # 3. Attempt to assume the role
+                response = sts_client.assume_role(
+                    RoleArn=role_arn,
+                    RoleSessionName="ConnectivityTestSession"
+                )
+
+                # 4. Use temporary credentials to create a target session
+                creds = response['Credentials']
+                target_session = boto3.Session(
+                    aws_access_key_id=creds['AccessKeyId'],
+                    aws_secret_access_key=creds['SecretAccessKey'],
+                    aws_session_token=creds['SessionToken']
+                )
+
+                # 5. Perform a "whoami" call in the target account
+                target_sts = target_session.client('sts')
+                identity = target_sts.get_caller_identity()
+                
+                print(f"{acc_name[:25]:<25} | {acc_id:<15} | ✅ Success")
+
+            except ClientError as e:
+                # Catch failures (e.g., role hasn't finished deploying or trust policy issue)
+                error_code = e.response['Error']['Code']
+                print(f"{acc_name[:25]:<25} | {acc_id:<15} | ❌ Failed ({error_code})")
+
+if __name__ == "__main__":
+    test_connectivity()