Can't send meeting invites

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Occasional Visitor

I am no longer able to send Outlook meeting invites from the desktop app or Office Online. When I send out a meeting invite, I receive the message "unexpected data was encountered. Mail could not be sent. Error code: -17997." When I log into Office Online, the meeting invite is there, but it says "You haven't sent this meeting invitation yet." But then I can't even get it to send from online, nor create a new meeting and send it. 

 

Outlook for Mac version 16.30

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