Hello Donne,
Thanks for reaching out. You need to use the start and end date time CalenderView endpoint as follows for example:
The 'ge' and 'le' operators are no supported with List CalenderView query.
Please refer to article https://learn.microsoft.com/en-us/graph/api/calendar-list-calendarview?view=graph-rest-1.0&tabs=http for more information on this topic.
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Thanks.