SAML Attribute
Allow users with specific SAML attributes.
{  "saml": {    "attribute_name": "group",    "attribute_value": "admins",    "identity_provider_id": "ca298b82-93b5-41bf-bc2d-10493f09b761"  }
}
{  "saml": {    "attribute_name": "group",    "attribute_value": "admins",    "identity_provider_id": "ca298b82-93b5-41bf-bc2d-10493f09b761"  }
}