A similar thread has been started here, it is possible but you need to set up additional things to allow the user to sign in.
For more information, see How to use make scenario as backend for SAAS
Hope this helps! Let me know if there are any further questions or issues.
— @samliew
P.S.: Did you know, the concepts of about 70% of questions asked on this forum are already covered in the Make Academy. Investing some effort into it will save you lots of time and frustration using Make later!