# 409 Conflict: There is currently a lease on the blob 'container/blob.txt'. No lease ID was specified in the request.

- **ID:** `cloud/azure-storage-blob-lease-conflict-while-deleting`
- **Domain:** cloud
- **Category:** protocol_error
- **Error Code:** `409`
- **Verification:** ai_generated
- **Fix Rate:** 92%

## Root Cause

The blob has an active lease (e.g., infinite or finite) that must be released or specified in the delete request, but the operation attempted to delete without providing the lease ID.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| azure_cli | active | — | — |
| storage_sdk | active | — | — |
| blob_service | active | — | — |

## Workarounds

1. **Break the lease first using Azure CLI: `az storage blob lease break --account-name mystorageaccount --container-name container --name blob.txt --lease-break-period 30`. Then delete: `az storage blob delete --account-name mystorageaccount --container-name container --name blob.txt`** (95% success)
   ```
   Break the lease first using Azure CLI: `az storage blob lease break --account-name mystorageaccount --container-name container --name blob.txt --lease-break-period 30`. Then delete: `az storage blob delete --account-name mystorageaccount --container-name container --name blob.txt`
   ```
2. **In code (Python SDK), get the lease ID and delete: `from azure.storage.blob import BlobClient; blob = BlobClient.from_connection_string(conn_str, container_name="container", blob_name="blob.txt"); lease = blob.acquire_lease(); blob.delete_blob(lease=lease)`** (90% success)
   ```
   In code (Python SDK), get the lease ID and delete: `from azure.storage.blob import BlobClient; blob = BlobClient.from_connection_string(conn_str, container_name="container", blob_name="blob.txt"); lease = blob.acquire_lease(); blob.delete_blob(lease=lease)`
   ```

## Dead Ends

- **** — If the lease is infinite (never expires), waiting won't help; you must break it explicitly. (80% fail)
- **** — The portal also requires lease ID for leased blobs; it will show the same error. (90% fail)