Need To Get Cardnonce And Cannot Get Callback?

I'm trying to follow this example to submit credit card information and get back a CardNonce. https://docs.connect.squareup.com/articles/adding-payment-form/ The form works. I can

Solution 1:

Looks like the problem was I was putting the following code usually generated form ASP.NET around my page elements and that was causing the issue.

<form id="form1" runat="server">
</form>

After I removed that, it started working.