The competitor self-sign-up is a great feature. However, if the coach does Accepts-All rather than accepting them individually, this results in an uncoded entry. Note how the entries that have the same registration time-stamp lack codes in the screencap.
Coding them presents no problem, but where we've noticed problems is when a coach drops an entry prior to the tournament start (and prior to the Tab Staff noticing the lack of code and whatever else that entails), the entry remains active and is paired. This results in a Bye/Forfeit.