Your Azure Active Directory token.
Automatically inferred from env var AZURE_OPENAI_AD_TOKEN if not provided.
For more, see this page <https://www.microsoft.com/en-us/security/business/identity-access/microsoft-entra-id>.__
azure_ad_token: SecretStr | None = Field(
default_factory=(secret_from_env('AZURE_OPENAI_AD_TOKEN', default=None))
)