Trouble finishing up my Mobile Select account

Just signed up for Xfinity internet and trying to add the mobile select (2 lines) for the current promo.  I get all the way to the Fulfillment Screen and when I hit next, it gives me an error message and tells me to try again later.

I have used the webpage on my phone, the app on my phone, and now the webpage on my desktop browser.  Can someone help me with this?