I ended up talking to Dell support and we tried a few more things but ultimately I reinstalled Windows and now I can use my PIN
Updated my Alienware Aurora R10 with the latest BIOS today.  After the install was completed, the system restarted.  Each time I do a BIOS update, I need to redo my PIN for Windows. I normally need to authenticate with Microsoft prior to resetting my PIN. I authenticated with Microsoft and received my code via email to reset my PIN and after I entered the code,  the system responded with "something went wrong" and two choices - Cancel or Retry. If I retried, I had to do the  whole process over only to have the same "Something went wrong" come up. I then tried to reset my PIN in the Windows security section in Windows 10 but it would not take. Each time I rebooted or shut down and restart, it would prompt me to reset my PIN at windows startup. I then found something on the Dell forum to delete the contents from my NGC folder. Tried that and I still cannot reset my PIN. If anything, now I get the windows prompt to "Login" and not to reset my PIN. I click the login button, the windows screen refreshes and prompts me to "Login" again. I need to do this several times before I see the Windows authentication screen. Still cannot reset my PIN. Any thoughts. It all started with this recent BIOS.
Aurora R10, BIOS 2.3.3. Windows Hello will not work now