I too am seeing this behavior today. I can enter the details, click the check on CAPTCHA, and then click the 'Sign Up' button and all that happens is CAPTCHA resets but the page doesn't submit. I've tried in four different browsers on two different devices, one of which was in Chrome (non-Incognito) and the other was Chrome Incognito mode to avoid any extentions from running in case those where hurting the process, the other two browers were Internet Explorer 11 and the latest Beta of Edge (Chromium flavor). I'm at a loss and want to sign my son up on our family account. I have one slot left and he had his hopes up for listening to music on his phone. PLEASE HELP!