Fix CredentialUnavailableError

✅ Solution

CredentialUnavailableError often arises when the requested authentication method in DefaultAzureCredential fails because the necessary environment variables, managed identity, or Azure CLI/PowerShell credentials are not configured or accessible. Resolve this by ensuring the expected authentication method is properly set up (e.g., setting AZURE_CLIENT_ID, enabling Managed Identity in Azure, or logging into Azure CLI/PowerShell) and that the application has the required permissions. Also review exclude configurations in DefaultAzureCredentialOptions, ensuring the desired authentication method isn't being unintentionally skipped.