Sending, receiving, and organizing email in Outlook.com
If you're experiencing issues with Outlook and not receiving emails, it could be due to various reasons such as a problem with your email account, the email app, or even a service outage. To determine if the issue is widespread, you can check the Microsoft 365 Service health status to see if there are any reported problems with the service.
If the problem is isolated to your account, you can try signing in to Outlook on the web to see if your email is functioning there. Additionally, running the Microsoft Support and Recovery Assistant can help diagnose and fix common issues related to Outlook.
If multiple users in your organization are having similar issues, it may indicate a service problem that needs to be addressed by your Microsoft 365 administrator.
References: