I think we see a good phishing email that gets spread through our organization, perhaps every few weeks. Lately, I think, with a few exceptions, our students and staff are getting better at identifying and flagging them in Exchange, while I end up going into the MS Defender console and extracting them from the system. But as you can see, even on a light day, phish messages can get through, despite best efforts.
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BTW - if you're not sure how to do this in Microsoft Defender, I would encourage you to learn how to use the Explorer blade of the Defender console and how to do an extraction, particularly if something gets delivered to thousands of mailboxes and you need to rip it out.
/r