I registered through the ada website again using the same DENTPIN, indicated I had taken the test before, and paid the fee to send my scores to some schools. However when I go to the prometric website to schedule my test it says my identification number is not recognized. I used this number (the DENTPIN number) when I signed up the first time and it worked, but now it's not. I know that I have to wait 90 days before I can take it again but that shouldn't stop me from signing up now so that I can take it 90 days from my first attempt. So what's going on? 😕