Hi,
Does the issue only happen to Outlook for Mac? How about other Office apps such as Word, Excel? Have you installed any updates recently?
Please restart Mac machine, then create a new profile for this account in Outlook to have a try:
- From Finder, open the
Applications
folder.
- Ctrl+click or right-click
Microsoft Outlook, and then click
Show Package Contents.
- Open
Contents >
SharedSupport, and then double-click
Outlook Profile Manager.
- Click the
Create a new profile button
Add, and then type a name for the new profile.
- Select this new profile, click
Set the default profile, and then click
Set as Default.
- Restart Outlook and setup this account.
Confirm if the issue can be fixed in new profile.
Best Regards,
Winnie Liang
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