Is anyone else experiencing trouble with verification code for the 1950 Census?

I submit my email address for a verification code and get nothing.  I click on "resubmit code" and get the first code (apparently) which comes back as invalid.  "Resubmit" again, another code comes.  Again invalid.  I'm ready and willing to transcribe names, but can't get in.

Also, I am an early bird, so I'm trying this at 7:30am today.  Sometimes it could be as early as 5am.