Hi @sajan arora ,
Per my understanding,if you use flow, you can try this template and add the users you want:
Then the user can receive the email push if he/she has logged in outlook:
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In fact, our team is dedicated to providing help on SharePoint, and Webhook is a feature more related to Azure. This may be beyond our scope, so I would suggest you post a new thread with the tag Azure, and they will provide more professional help.
Sorry for the misunderstanding and hope your issue will be resolved as soon as possible. :)
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