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I've added a Repeat Email Address field on the WooCommerce checkout page with the following add function:

// EMAIL Confirmation on CHECKOUT PAGE

add_filter( 'woocommerce_checkout_fields' , 'email_verification_field_checkout' );

 function email_verification_field_checkout( $fields ) 

 $fields['billing']['billing_email']['class'] = array('form-row-first');
 $fields['billing']['billing_email_verification'] = array(
 'label' => __('Repeat Email Adress', 'woocommerce'),
 'required' => true,
 'class' => array('form-row-last'),
 'clear' => true,
 'priority' => 999,
 );

 return $fields;
 

// CHECK IF THE TWO EMAILS MATCH !!!
 add_action('woocommerce_checkout_process', 'mycheck_email_addresses');

 function mycheck_email_addresses() 
 $email1 = $_POST['billing_email'];
 $email2 = $_POST['billing_email_verification'];
 if ( $email2 !== $email1 ) 
 wc_add_notice( __( 'Your email addresses don't match!', 'woocommerce' ), 'error' );
 
 

Returning Customers can login on top of the page.
WooCommerce then gets the email address for the filed "billing_email" adress.

1) Is there a way to add a function to do the same for the added "billing_email_verification" field?

2) I tried an add function for the case that a Returning Customer logs in on top of the checkout page: In this case I would love to hide the "Repeat Email Address" field for better customer experience. But unfortunately that didn't work. I'm just starting out to understand filters and hooks and would appreciate a helping hand :)

add_filter( 'woocommerce_checkout_fields' , 'my_override_checkout_fields' );
function my_override_checkout_fields( $fields ) 
 if( is_user_logged_in() )
 unset($fields['billing']);
 $fields['billing_email_verification'] = array();
 
 return $fields;

I've found the mistake in the solution for case 2)
Here is the correct filter for case 2)

add_filter( 'woocommerce_checkout_fields' , 'my_override_checkout_fields' );
function my_override_checkout_fields( $fields ) 
 if( is_user_logged_in() )
 unset($fields['billing']['billing_email_verification']);
 
 return $fields;

Anyhow, I would love to learn how I can approach case 1) something with get_value
Does someone know how to do this?