Based on your requirement, I recommend you to use iCalUId instead.
The iCalUId returned by the Calendar event resource type in Microsoft Graph is defined as a unique, read-only identifier that is shared by all instances of an event across different calendars.
References -
- https://developer.microsoft.com/en-us/office/blogs/microsoft-graph-calendar-events-icaluid-update/
- https://learn.microsoft.com/en-us/graph/api/resources/event?view=graph-rest-1.0
Hope this helps. Thanks!