Why are my events not showing up on my Microsoft calendar after updating my device’s operating system?

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1. Check Microsoft’s service status.
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2. Restart the device.
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3. Make sure the calendar app is up-to-date.
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4. Check the app permissions to make sure the app is authorized to access the calendar.
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5. Check the device's time zone to see if it's the same as the calendar.
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6. Check the device settings to make sure the calendar is syncing.