https://news.vt.edu/notices/2024/01/it-using-exchange-online-students.html
Exchange needs some training for its junk mail handling. You will need to mark stuff as Not Spam when its falsely dropped into Junk Mail folder and Span when it's dropped into your Inbox. Over time this info builds up and Exchange Online will learn how to handle your mail.
Stopping Email from Going to Spam
Self-reporting Spam and Phishes
Looking at customized simple display settings. The Inbox defaults to Focused mode. This can cause confusion. Focused Inbox can be turned off by following these steps:
Time Zones. If an individual reports seeing oddities with email time stamps, it's probably from OL/OWA setting their time zone in an unexpected manner. To check and set your time zone:
Focused Inbox. Focused Inbox is a view within Outlook that can help highlight important messages; however, until it is trained, it can hide important messages.