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Remove-CalendarEvents cmdlet does not work
I used that several times and had a cheat-sheet with commands to clean recurring meetings of persons who has left the company. That did not work the last time, returning error: Remove-Calend...
I had the exact same problem.
Then i noticed the error message always translating whatever timedate-string I attempted to use to my locale.
The error was introduced by some Microsoft Engineer unable to take into account the existence of other languages but US-English.
Try setting your region settings in the OS to US English. Then start a new powershell. Connect to Office 365. Issue the command.
Just use "neutral" notation such as "4 Nov 2019".