Hi @ebeltran
Welcome to the Auth0 Community!
Allow me some time to search for this behaviour, but in the mean time, just to get this possible cause out of the way, are you using the " Try " feature from the Database to check, or are you performing a complete login flow in an application? This was the issue in this following post on a very similar issue : Custom field does not display on Universal Login Signup page - #4 by jan.clayton
Looking forward to your reply!
Gerald