Η Microsoft is working on a fix in Outlook, for a known issue that may be preventing them from Clients configure Exchange Online mailboxes in the Exchange Online mailboxes in the Windows.
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These configuration problems are due to bugs flow Auto Discover with 603 codes, after stopping the configuration process during the Outlook connectivity test.
The known issue affects several Outlook clients, with the full list including Outlook for Microsoft 365, Outlook 2021, Outlook 2019 and Outlook 2016.
Microsoft Add that while the root cause behind these configuration problems has already been identified as a service problem, a code fix that addresses it will be developed soon.
Meanwhile, the IT administrators can fix it manually using the following steps:
Sign in to Exchange Online PowerShell
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Confirm that Get-Mailbox shows the sharing policy for a deleted object by running Get-Mailbox: Get-Mailbox -ResultSize 10 |fl *sharingpol*
Reset the default sharing policy by running:
New-SharingPolicy -Name "Default Sharing Policy" -Domains '*:CalendarSharingFreeBusySimple', 'Anonymous:CalendarSharingFreeBusyReviewer' -Enabled:$true -Default:$true
Confirm that Get-Mailbox no longer shows the Sharing Policy for a deleted item: Get-Mailbox -ResultSize 10 |fl *sharingpol*
Η Setting mailbox configuration in Outlook should work again after the above steps.
See also: How to block a domain in Microsoft Outlook
Two weeks ago, Microsoft began showing off a repair for another issue known since August, which causes Outlook for Microsoft 365 to freeze and stop after launching.
The company also recently corrected a error interrupting the Outlook email client when reading email messages containing tables, such as receipt emails Uber.
