Updated readme for no-subscriptions support

README.md

@@ -130,6 +130,29 @@ The following steps describe how to create the service principal, assign the rol
 
 NOTE: to manage service principals created with `az ad sp create-for-rbac`, visit the [Azure portal](https://portal.azure.com), navigate to your Azure Active Directory, then select **Manage** > **App registrations** on the left-hand menu. Your service principal should appear in the list. Select a principal to navigate to its properties. You can also manage role assignments using the [az role assignment](https://docs.microsoft.com/cli/azure/role/assignment?view=azure-cli-latest) command.
 
+## Support for using `allow-no-subscriptions` flag with az login
+
+Capability has been added to support access to tenants without subscriptions. This can be useful to run tenant level commands, such as 'az ad'. The action accepts an optional parameter `allow-no-subscriptions` which is `false` by default.
+
+```yaml
+# File: .github/workflows/workflow.yml
+
+on: [push]
+
+name: AzureLoginWithNoSubscriptions
+
+jobs:
+
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    steps:
+
+    - uses: azure/login@v1
+      with:
+        creds: ${{ secrets.AZURE_CREDENTIALS }}
+        allow-no-subscriptions: true
+```
+
 # Contributing
 
 This project welcomes contributions and suggestions.  Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.opensource.microsoft.com.