Hi everyone,
One of my Power Automate cloud flows started failing suddenly a few days ago. The flow uses the Office 365 Outlook calendar change trigger:
- Connector: Office 365 Outlook
- Trigger operationId:
CalendarGetOnChangedItemsV3
- Trigger:
When an event is added, updated or deleted (V3)
- Parameters:
incomingDays: 90pastDays: 15
splitOn: @triggerOutputs()?['body/value']
The trigger was working before, but now the trigger fails with HTTP 400.
Error response:
{
"statusCode": 400,
"body": {
"status": 400,
"message": "Office 365 calendar does not support change trigger.\r\nclientRequestId: [redacted]\r\nserviceRequestId: [redacted]",
"errors": []
}
}
The Korean localized message is:
Office 365 일정은 변경 시 트리거를 지원하지 않습니다.
I would like to know:
- Did Microsoft recently change the behavior or support scope of
CalendarGetOnChangedItemsV3?
- Is this trigger no longer supported for shared calendars, resource calendars, room calendars, or Microsoft 365 Group calendars?
- Is this a known temporary issue with the Office 365 Outlook connector?
- If this trigger is not reliable anymore, is the recommended workaround to use a scheduled recurrence flow and poll calendar events instead?
I have not changed the flow logic recently. The failure appears to happen at the trigger level, before the flow actions run.
Any confirmation or workaround would be appreciated.
