I figured it out. I had to log out of Neverwinter, then log back in using my Cryptic display name and not my email address. That allowed me to finally link the accounts on this end.
I have a related issue. I've downloaded the launcher, and I first put in my account name to try to log in, and that didn't work. I then used my email, and I received a message saying I needed to link my account, with a web address. I went to that site, and was told that there was a Display Name conflict. In the past, I…