Can't remove office calendar item from my macbook calendar

Hello,

I’m encountering a problem with my MacBook Calendar app that I hope someone here can help me resolve.

I’m using a MacBook Pro 13-inch M2 (2022) with macOS Sequoia 15.1. I have an Office 365 account synced with the Calendar app, and typically, when I delete a calendar item in Outlook, it’s removed from my MacBook calendar as well. However, I’m having trouble with one particular item from a specific sender—it continues to appear in my MacBook calendar even though I’ve deleted it in Outlook.

This issue only occurs on my MacBook; on my iPhone, the calendar syncs correctly, and the item does not show up. The problem seems isolated to items from this one sender—all other items delete and sync without issues across my devices.

I’ve tried refreshing both Outlook and the MacBook Calendar app, but this item still won’t go away. Any advice on how to resolve this would be much appreciated!

Thank you!