Can't Delete iCloud Calendar Notifications From Outlook 2016

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New Member
Outlook version
Outlook 2016 64 bit
Email Account
Exchange Server
I have 4 calendar invites (notifications) showing up in my iCloud Add-In Notification in Outlook 2016. They are all from 2015.

I click on one of them and click Decline (Any of the 3 options returns same error) and I get a response that says;

I've tried refresh, adding a calendar entry on my calendar consistent with the "old" notifications and then declining with the same above response. I've tried a couple of "internet" suggestions that haven't resolved the issue either. Stumped at this point. Looking for a way to get rid of these.
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