I, too, am having problems with my client's being able to authenticate thru the KBA system.  They are getting stuck on "what's your address?" and they fail authentication. I have voided and resent more than 3 times and after that, I have to go with physically signing.  One client is a realtor who used DocuSign a lot.  I am wondering if they changed the level of security but this just started yesterday with my entities which are due today.   What a pain!