JSFiddle - React, Tailwind, and code Playground
HTML
<div class="col-3">
<label for="manager_select">Your Manager</label>
<select name="manager_name" class="form-control" id="manager_select" required>
<option value="" disabled>Your Manager</option>
<option value="Test">Test</option>
</select>
<input type="hidden" value="ppppp" name="email_address" id="email">
JavaScript
$(document).ready(function() {
alert($('#email').val())
$('#manager_select').val();
})