Fix CredentialUnavailableError

✅ Solution

CredentialUnavailableError in Azure SDKs like azure-keyvault usually means the DefaultAzureCredential cannot find suitable credentials in the configured environments (e.g., environment variables, managed identity, Azure CLI). Ensure necessary environment variables (AZURE_CLIENT_ID, AZURE_CLIENT_SECRET, AZURE_TENANT_ID, etc.) are set correctly based on your authentication method, or that your managed identity is properly configured and enabled if running in an Azure environment. If using exclusions in `DefaultAzureCredentialOptions`, verify they are not inadvertently excluding the intended authentication method.