Getting firebase_auth/invalid-credential when attempting login

[NeoFahrenheit]

I followed this tutorial: https://www.youtube.com/watch?v=FkFvQ0SaT1I

I used the flutterfire configure to automatically generate a firebase_options.dart to my project. I enable signed in with email and password in my Firebase project settings. I manually created a user in the Firebase console and logged in successfully one time. When I modified the UI a bit, I tried again and I started getting this error:

I/FirebaseAuth(10074): Logging in as [email protected] with empty reCAPTCHA token
W/System (10074): Ignoring header X-Firebase-Locale because its value was null.
D/TrafficStats(10074): tagSocket(73) with statsTag=0xffffffff, statsUid=-1
E/RecaptchaCallWrapper(10074): Initial task failed for action RecaptchaAction(action=signInWithPassword)with exception - The supplied auth credential is incorrect, malformed or has expired.
E/flutter (10074): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: [firebase_auth/invalid-credential] The supplied auth credential is incorrect, malformed or has expired.
E/flutter (10074): #0 FirebaseAuthHostApi.signInWithEmailAndPassword (package:firebase_auth_platform_interface/src/pigeon/messages.pigeon.dart:1130:7)
E/flutter (10074):
E/flutter (10074): #1 MethodChannelFirebaseAuth.signInWithEmailAndPassword (package:firebase_auth_platform_interface/src/method_channel/method_channel_firebase_auth.dart:332:22)
E/flutter (10074):
E/flutter (10074): #2 FirebaseAuth.signInWithEmailAndPassword (package:firebase_auth/src/firebase_auth.dart:578:9)
E/flutter (10074):
E/flutter (10074): #3 LoginPage._signIn (package:time_manager/screens/settings/pages/login_page.dart:61:26)
E/flutter (10074):

I tried logging out with Firebase.instance.signOut() and reconfiguring the project.
After several tries, I received the following message in the debug console:

E/RecaptchaCallWrapper(17561): Initial task failed for action
RecaptchaAction(action=signInWithPassword)with exception - We have
blocked all requests from this device due to unusual activity. Try
again later. [ Access to this account has been temporarily disabled
due to many failed login attempts. You can immediately restore it by
resetting your password or you can try again later. ]

It seems there is nothing wrong with auth configuration or credentials, as the Firebase was noticing my login attemps. I tried reseting the password to a super easy one. It did not work.

I also tested FirebaseAuth.instance.createUserWithEmailAndPassword and it worked fine too. Login stills giving me the problems described above.

Why it was working one time and in the same day, a few minutes later, it stopped working?
Anyone has ideias?

Thank you!