Outlook 365 is an eminent email client that supports various functions like emailing, journals,
notes etc. There are various ways to fix Outlook 365 problem Like email not received
1. Check Email Arrival From Other System
2. Check Blocked Sender list
3. Mailbox Check on web server
4. Spam Folder Check
Read more here:- https://www.datarecovo.com/outlook-not-receiving-email-how-to-fix/
Try this:
Repair a profile in Outlook 2010, Outlook 2013, or Outlook 2016
In Outlook 2010, Outlook 2013, or Outlook 2016, choose File.
Choose Account Settings > Account Settings.
On the Email tab, choose your account (profile), and then choose Repair.
Note: The Repair option isn't available if you're using Outlook 2016 to connect to an Exchange account.
Follow the prompts in the wizard, and when you’re done, restart Outlook.
Outlook connection still not working?
Run Windows Update to make sure you have the latest updates for Outlook and other desktop apps for Microsoft 365.
Download and run the Microsoft Support and Recovery Assistant.
The Microsoft Support and Recovery Assistant works by running tests to figure out what's wrong and offers the best solution for the identified problem. It can currently fix Office, Office 365, Outlook, and Windows problems.
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Regards, Caleb