Causeīy default, Outlook 2016, Outlook 2019, and Outlook for Office 365 use a new modern authentication stack. After a progress window opens briefly, you are returned to the calendar module without a new calendar added. Additionally, you don't receive any error message. When you use this method for some Internet servers, the calendar is not added successfully.
You try to add an Internet calendar in Microsoft Outlook 2016, Outlook 2019, or Outlook for Office 365 by following these steps: Applies to: Outlook 2019, Outlook 2016, Outlook for Office 365.You can't add an Internet calendar in Outlook 2019, Outlook 2016, and Outlook for Office 365
