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APPLIES TO: 
Azure Database for PostgreSQL - Flexible Server
Following is the list of errors that the Azure Storage extension can return, and the reasons why, or the circumstances in which, they can be seen.
ERROR: azure_storage: Permission is not sufficient to perform requested operation
When executing any of the functions that interact with Azure Storage (azure_storage.blob_list, azure_storage.blob_get or azure_storage.blob_put) and the System Assigned Managed Identity isn't granted the adequate data plane roles or permissions (typically a minimum of Storage Blob Data Contributor for azure_storage.blob_put, and a minimum of Storage Blob Data Reader for the other two functions).
It may also be the case that you have already granted the minimum required permissions but they aren't yet in effect. It can take a few minutes until those permissions get propagated.
ERROR: azure_storage: missing storage credentials
When executing any of the functions that interact with Azure Storage (azure_storage.blob_list, azure_storage.blob_get or azure_storage.blob_put) and the credentials with which you want the extension to authenticate with the storage account aren't registered using azure_storage.account_add.
ERROR: azure_storage: internal error while connecting
When the instance of flexible server can't reach the target storage account. That could happen in the following cases:
- The storage account doesn't exist.
- Networking configuration doesn't allow traffic originated from the instance of flexible server to reach the storage account. For example, when the instance of flexible server is deployed with public access networking, and the storage account is only accessible via private endpoints.
When the System Assigned Managed Identity isn't enabled in the instance of flexible server.
ERROR: azure_storage: storage credentials invalid format
When the System Assigned Managed Identity is enabled on the instance of flexible server, but the server hasn't been restarted after enabling it.
ERROR: azure_storage: current user <user_or_role> isn't allowed to use storage account <account_name>
When executing any of the functions that interact with Azure Storage (azure_storage.blob_list, azure_storage.blob_get or azure_storage.blob_put) with a user or role that isn't member of azure_storage_admin and isn't granted permissions, using azure_storage.account_user_add, to use the referred storage account.