PLEASE IGNORE - Temporary item created by Microsoft Conferencing Add-in for Outlook (Version 8.0.6362.187)

Error

I faced similar issue with Conferencing add-in Version 8.0.6362.143 and 8.0.6362 .187 versions .And users were receiving empty appointments in their calendar. With subject line

PLEASE IGNORE - Temporary item created by Microsoft Conferencing Add-in for Outlook (Version 8.0.6362.187)

Resolution

I updated the Conferencing add-in with Version 8.0.6362.190 (or above will help ) and resolved the issue