How to ensure when a user signs in they enter matching email and password used during registration before accessing the app

Hello everyone, i have intergrated firebase email auth into my app, but how do i ensure when a user logs in, they enter matching email and password used during registration?
I tried signing into the app using an email that’s not registered and to my surprise, i got in. That’s not secure, is it?

How do i go about this?

2023-09-08_09-25-47

What’s the action for navigation?

2023-09-08_13-15-01
2023-09-08_13-12-47


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