I am developing an Outlook add-in. My add-in needs to authenticate the user in order to perform some api calls to my server.

I have created a login page inside the add-in task pane so the user can input their credentials before starting to use the add-in functionalities. The user may login with a different account from the one he is signed in in Outlook. Do I need to implement SSO for my add-in or is this approach valid?