Check if email exists in PrivateMemberData

Hi,

I would like create a safe custom log in by:

1. User enters email in the email input

2. User clicks the "confirm" button

3. If email exists; password field shows. But, if email does not exist; error message: "Email does not exist" shows

(I know how to create the custom log in; just confused how to check the email's existence first)

This is my code, but this does not work; I want the action to take place when the user click the confirm button

 export function confirm_click(event) { 
 let email = $w('#email').value     
 wixData.query('PrivateMembersData')       
 .eq('emails', email)       
 .find()       
 .then((res) => {  
 if(res) {               
 $w('#password').show()           
 } else {    
 $w('#errorMessage').show()       
 })  
  }

the email field for PrivateMemberdata looks like this:

Field Name: Emails

Field Key: emails

I hope you can help me

Thanks in advance