When the Account was Authenticated. Some broker connections (e.g. CQG, Rithmic, ETNA, ORBIS, StoneX, Tradovate, TransACT) require the broker to approve the account, while others (e.g. IB) don't, in which case the date will be when the client setup Autotrading. NULL if never approved by the broker and it is a broker that requires account approval
{ "Id": 0, "PersonId": 0, "Account": "string", "BrokerName": "string", "BrokerId": 0, "FirstName": "string", "LastName": "string", "Email": "string", "Language": "string", "WhiteLabelSiteId": 0, "GeoSite": "string", "CountryCode": "string", "DivisionCode": "string", "AuthenticatedDate": "2019-08-24T14:15:22Z" }