Outlook - Exchange Server re-created a meeting that was missing from your calendar

Have you declined the entire series or single occurrence?

I have declined the entire series and even deletes the entire series many times.

Follow the below steps to fix it.

1. Copy the subject of the meeting invite.
2. Search in the inbox with the subject.
3. If you see any meeting invite emails in your inbox, then just delete them.
4. That's it... 😎

Great. it works. Saved lot of my time. Thanks.