Simplenews- unsubscribing from test newsletter

I was taking care of some last issues for my wife's website related to the newsletter (an email list managed by Drupal simplenews).  My last issue that was outstanding was when I tried to unsubscribe from the newsletter that i just sent out for a test, I got a 404 error.

I did a 2nd test in which I actually sent out the list (not a test), had to create a another newsletter for that!  When I sent out the email blast for real (as opposed to a test), the unsubscribe worked!