
Based on your description, I understand that you want to send notification to manager when today exceeds due date.
You could create a flow as following example.
Expressions are:
formatDateTime(utcNow(),'yyyyMMdd')
formatDateTime(triggerOutputs()?['body/DueDate'])
If you set 10th June as due date, when today exceeds 10th June, for example today is11th June, then a notification email will be sent to manager.
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