@Ganesh Kumar Sivagurunathan (CIS)
Welcome to Microsoft Q&A and thank you for posting your question here.
To understand your question, you will like to confirm the register app that is in use and identify who the users are accessing it. To add more clarification, I would like to know the authentication tool you used.
However, to access authentication method usage and insights:
Sign in to the Azure portal.
- Click Azure Active Directory > Security > Authentication Methods > Activity.
Also, to confirm if the register app is in use and identify who are all the users accessing it, you can follow these steps:
Go to the Azure portal and sign in with your account.
Select Azure Active Directory from the left-hand menu.
Select App registrations under Manage.
Select the app you want to check.
Under Manage, select Activity.
- You can see the list of users who have accessed the app.
I hope this is helpful! You can vote for this answer if you found it useful. PS: Do not hesitate to let me know if you have any other questions.
Best Regards,
Sina Salam