I am unable to log in using email and password

starting last week i have been unable to log in using email and passwpord— my developer also has the problem. the only way i can get in is by using the google tab… this only started at the bigginning of last week

Once you have logged in using the Google third-party authentication method, your account is linked with this method and you cannot use the login/password method anymore. Is this method causing issues? If not, why would you want to still be using a password instead?