Can't preview my app because of logging problems

I already have a account, when I click preview , it still need me to login. And it showed me this, hello! Anyone can figure it out?

Hi @Jacob2,

Welcome to the community! :partying_face:

Are you facing this issue still? If it is does the user data you entered are not already there in the users collection? The login form is a built in form right? What are the actions attached do to the submit button?

Thank you