Kind of an odd one, we recently upgraded from ZCM 11.4 to ZCM 2017 2a.
Users with DAU in their username are having their account and profile deleted. I know that temporary DAUxx-xxxx (where x is a number) are created for bundles. But in this case simply having DAU in the username is causing the user/profile to be deleted (kDAUgher, pDAUghertly, and of course dauser).

Any idea's out there?