Login not working... why?

Try this one. Test it first.
If it works for you, add & modify the code by your further needs.

import wixUsers from 'wix-users';

$w.onReady(async function(){
 let user = wixUsers.currentUser; console.log("Wix-User-Data: ", user)
 let userId = user.id; console.log("User-ID: ", userId) 
 let isLoggedIn = user.loggedIn; 

 if(isLoggedIn) {console.log("User already logged in! Changing BTN-Label to ---> Log-Out")
        $w('#loginButton').label = "Log-Out", $w("#cuenta").show('fade');
 }
 else{console.log("User not logged in! Changing BTN-Label to ---> Log-In")
        $w('#loginButton').label = "Log-In", $w("#cuenta").hide('fade');}

    $w('#loginButton').onClick(()=>{console.log("Log-In-Button clicked!")
 if(isLoggedIn) {logOut();}
 else{promptLogin();} 
 });
});


function promptLogin() {console.log("Log-In running...")
    wixUsers.promptLogin()
 .then((user) => {
 let userId = user.id; console.log("User-ID: ", userId);
 let isLoggedIn = user.loggedIn; console.log("User-LogIn-State: ", isLoggedIn)
 return user.getEmail();
 })
 .then((email)=> {
 let userEmail = email; console.log("User-Email: ", userEmail)
 })
 .catch((err)=>{let errorMsg = err; console.log(errorMsg), console.log("Something gone wrong!")});
}

function logOut() {console.log("Log-Out process running...")
 //$w("#cuenta").hide(); //<--- this should be setted up in the wix-editor as current state
 //$w('#loginButton').label = "Log-In" //<--- this should be setted up in the wix-editor as current state
    wixUsers.logout();
}

As you can see, i implemented the Login-Button-Function directly into the Sw.onReady-code-part. Please pay attention on it. You won’t need the setted-up connection in the wix-editors properties-panel anymore.