Using New Outlook on Windows for professional communication and productivity
Had this issue. Found this post. Found a reply linking me to https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/outlook-on-the-web/enable-disable-employee-access-new-outlook#enable-or-disable-the-new-outlook-for-windows-for-an-individual-mailbox. I started testing with a handful of users. Initially, on Windows 11 I could not add an Exchange only account. I then ran the PS Command to check the value for the allowed access to the new Outlook. The users we tested were indeed set to no value. I set them to true, patiently waited for a few hours, then could add them to the machines needed. I believe they may have a bug in code or a typo in documentation, but it seems to me that -OneWinNativeOutlookEnabled has to be set to true and replicated through the O365 servers to appropriately work.