Dear Azeem Qaiser,
Good day! Thank you for posting to Microsoft Community. We are happy to help you!
Based on your description, first of all, please confirm that your outlook client has been updated to the latest version.
Also, if you are using the classic version of outlook, then please switch to "New Outlook" to check the results.
At the same time, please also try to uninstall your outlook and then reinstall to add your account, please kindly refer to the specific steps: After installing the Office apps, you'll want set up Outlook to start using email, calendar, and contacts. Here's how.
Open the Start menu. Search for Outlook, and choose it.
Enter your Microsoft 365 email address, and select Connect.
Enter any additional email addresses that you want to use, such as your previous or personal email address. Select Next.
If prompted, enter a password, and then select Sign in.
After all of your accounts have been added, choose if you want to set up Outlook mobile or wait until later.
Select Done. It may take several minutes for Outlook to download your email and other data.
If your problem persists, since we specialize in technical support for Microsoft 365 Business Exchange Online, which is not professional for the Outlook for Mac, in order to better help you and no longer waste your more time. I recommend that you ask for help from our dedicated team, where technical engineers specialize in these related issues, and experts will focus on inquiries to further assist you, for details, please kindly refer to: Contact support within Outlook for Mac
Thanks in advance for your understanding! Your patience and cooperation will be highly appreciated. Hope you all the best!
Sincerely,
Kerry Chen | Microsoft Community Moderator
