savsoft,
попробуйте так
<!DOCTYPE html>
<html>
<head>
<title>Клиенты</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.5.1.min.js" integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0=" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
</head>
<body>
<div class="container-fluid">
<div class="row">
<table class="table table-bordered">
<thead>
<tr>
<th style="text-align: center;">Телефон</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="spantocopy" data-toggle="tooltip" style="cursor: pointer;">111111111111</span></td>
</tr>
<tr>
<td><span class="spantocopy" data-toggle="tooltip" style="cursor: pointer;">222222222222</span></td>
</tr>
<tr>
<td><span class="spantocopy" data-toggle="tooltip" style="cursor: pointer;">333333333333</span></td>
</tr>
<tr>
<td><span class="spantocopy" data-toggle="tooltip" style="cursor: pointer;">444444444444</span></td>
</tr>
<tr>
<td><span class="spantocopy" data-toggle="tooltip" style="cursor: pointer;">555555555555</span></td>
</tr>
</div>
</div>
<script>
jQuery('[data-toggle="tooltip"]').tooltip({
trigger: 'manual',
title: function() {
return `Номер ${this.textContent} скопирован`
}
}).on('click', function() {
let span = this;
navigator.clipboard.writeText(span.textContent);
jQuery(span).tooltip('show')
window.clearTimeout(span.timer);
span.timer = window.setTimeout(_ => jQuery(span).tooltip('hide'), 1500)
})
</script>
</body>
</html>