Getting "Service Unavailable" response while get all calendar from the outlook

Hari 11 Reputation points
2023-06-16T07:57:39.43+00:00

We have more than 1000 calendars in the Outlook. When retrieving calendars within the specified ranges (0-200, 200-400, 600-800), the response time from the Microsoft is increase exponentially. While we 800-1000 calendar, we received the "Service Unavailable" response from the Microsoft. User's image

Microsoft Security | Microsoft Graph
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