We're seeing the same thing.  Actually we saw it during pre-signup.  Reached out to Disney+ weeks ago as well, with no response.  Now it's launched, our support lines are flooded with people unable to give Disney all their moneys.    We finally got through to Disney+ support after 2.5hrs on hold to supply them the error code, IP address, and zip code.. we'll see if it's passed to the right folks.