Previously available with a Microsoft 365 account or as part of the Office for Mac app. Removed all MS-related entries under Keychain AccessĬompletely reset outlook (Terminal: defaults remove com.microsoft. Original story: Microsoft is making the Outlook for Mac app free to use, the company announced this week. On Windows, this problem can occur as well but it can easily be solved with the registry setting "ExcludeExplicitO365Endpoint", which doesn't seem to exist on macOS. To do this task, we recommend using this site. It doesn't matter if we enter the correct password or not, it shows up every time. To download MS Outlook 2019 for Windows 10/11 64-bit & 32-bit and install it, you can go to use an ISO file of Office 2019 to install the suite including Outlook 2019, Word 2019, Excel 2019, PowerPoint 2019, etc. We cancel the 365 sign-in prompt and the account is successfully set up.īut unfortunately, the 365 authentication prompt (username suggested: reappears at every Outlook launch. At the same time, the AutoDiscover confirmation prompt appears, which we accept. When we try to add said mailbox in Outlook, a modern authentication dialog is shown. The affected user has a mailbox with the UPN and mail address which is hosted on said Exchange 2019 organization. There are no Exchange Online mailboxes at all in this tenant, because they've got On-Premises Exchange 2019 (DAG). Outlook is activated through an AD synced Office 365 account with username This account only has an Microsoft 365 Apps for Enterprise license assigned. We have a Mac with the newest macOS and the most recent Outlook version v16.66 (it's evil).
I've just wasted 2 hours trying to resolve the following problem:
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