When testing last week, I was seeing test events in the .ics data file but was receiving the same error message you did from The Events Calendar.
I think the issue may have been that there were other test events in the .ics file that had already been imported. I was adding new items to Outlook 365, but they were being placed into a different calendar.
If anyone else encounters this issue, make sure you are selecting the same calendar in the dropdown that you published. This dropdown is not highlighted in the interface and can easily overlooked.
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This reply was modified 8 years, 9 months ago by
Mitchum.
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This reply was modified 8 years, 9 months ago by
Mitchum.