Hi @Akiles
Welcome to Microsoft Q&A! Thanks for posting the question.
Based on my understanding, you are trying to send notification when a new user is created in the organization. Please refer to the link below for a similar discussion:
https://learn.microsoft.com/en-us/answers/questions/597295/get-notifications-based-on-new-user-added-or-delet.html
You may also refer to the following links which propose a similar solution using Azure Function App and .NET SDK:
1. Azure Function
2. .NET SDK Tutorial.
Please let me know if you have any questions.
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