Problems with the ACGIP Conference Project - html

Question

So I have already attempted to do this project by myself but the program I'm using as a sandbox seems incredibly picky at how one is to do it. Despite using examples and other aids to help get this done, nothing has worked. I'm having three separate issues that I think I have done correctly but, apparently, had not done correctly. The issues are as followed:
Script & Form Elements
The Regex
The Submit Button
The program will not tell me what's being done wrong either. Might I get some aid?
<section>
<h1>Conference Registration Form</h1>
<p>Required Item (*)</p>
<form action="http://www.example/cg/register" method="post">
<!-- title -->
<div>
<label for="title">Title</label>
<input type="text" name="title" id="titleBox" list="titleList">
<datalist id="titleList">
<option value="Mr."></option>
<option value="Mrs."></option>
<option value="Ms."></option>
<option value="Prof."></option>
<option value="Dr."></option>
<option value="Assist. Prof."></option>
<option value="Assoc. Prof."></option>
</datalist>
</div>
<!-- firstName -->
<label for="firstName">First Name*</label>
<input type="text" name="firstName" id="fnBox" required>
<!-- LastName -->
<label for="lastName">Last Name*</label>
<input type="text" name="lastName" id="lnBox" required>
<!-- address -->
<label for="address">Address*</label>
<textarea name="address" id="addBox"></textarea>
<!-- Company or University -->
<label for="group">Company or University</label>
<input type="text" name="group" id="groupBox">
<!-- E-mail -->
<label for="email">E-mail*</label>
<input type="email" name="email" id="mailBox" required>
<!-- Phone Number -->
<label for="phoneNumber">Phone Number*</label>
<input type="tel" name="phoneNumber" id="phoneNumber" required pattern="^\d{10}$|^(\(\d{3}\)\s*)?\d{3}[\s-]?\d{4}$" placeholder="(nnn) nnn-nnnn">
<!-- ACGIP Membership -->
<label for="acgipID">ACGIP Membership Number</label>
<input type="text" name="acgipID" id="idBox" placeholder="acgip-nnnnnn" pattern="^acgip\-\d{6}$">
<!-- Registration Category -->
<label for="regList">Registration Category</label>
<select id="regList" name="">
<option value="member">ACGIP Member ($695)</option>
<option value="nonmember">ACGIP Non-Member ($795)</option>
<option value="student">ACGIP Student ($310)</option>
<option value="poster">ACGIP Poster ($95)</option>
<option value="guest">ACGIP Guest ($35)</option>
</select>
<!-- Button -->
<p><input type="submit" name="continue" value="Continue"></p>
</form>
</section>

Answer 1

The code for the regex is wrong here.
it should be:
<input type="text" name="phoneNumber" id="phoneBox" placeholder="(nnn) nnn-nnnn" pattern="^\d{10}$|^(\(\d{3}\)\s*)?\d{3}[\s-]?\d{4}$" required />
NOT
<label for="phoneNumber">Phone Number*</label>
<input type="tel" name="phoneNumber" id="phoneNumber" required pattern="^\d{10}$|^(\(\d{3}\)\s*)?\d{3}[\s-]?\d{4}$" placeholder="(nnn) nnn-nnnn">
It gives an error every time. Cheers