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New Outlook - Cannot connect to server
A few of us in the IT Department are trying to preview the new Outlook. When we click the slider the new Outlook launches, sits at the Setting up account for a few minutes, then errors out with "...
I was actually able to figure this out in my organization at least. I found this article,https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/outlook-on-the-web/enable-disable-employee-access-new-outlook, and determined that OneWinNativeOutlookEnabled has to be set to $true. If it is set to $false or blank for a user then they cannot connect.
As soon as I changed it from blank to $true, and waited about 15 minutes for it to propagate, for my colleague and I the issue went away
In our case i managed to solve this after setting 'OneWinNativeOutlookEnabled' to $true
Set-CASMailbox -Identity -OneWinNativeOutlookEnabled $true