Remove Basic Auth functionality for Event Espresso 4 core. You can use the Application Passwords plugin instead. https://wordpress.org/plugins/application-passwords/

remove_basic_auth.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

add_action( 'plugins_loaded', 'my_remove_basic_auth_from_ee', 2 );
function my_remove_basic_auth_from_ee() {
    remove_filter( 'determine_current_user', 'json_basic_auth_handler', 20 );
    remove_filter( 'json_authentication_errors', 'json_basic_auth_error' );
    remove_filter( 'rest_authentication_errors', 'json_basic_auth_error' );
}