No team creation is allowed within the last 5 days of the competition.

Here's what the rules state:

The Zindi data scientist who sets up a team is the default Team Leader but they can transfer leadership to another data scientist on the team. The Team Leader can invite other data scientists to their team. Invited data scientists can accept or reject invitations. Until a second data scientist accepts an invitation to join a team, the data scientist who initiated a team remains an individual on the leaderboard. No additional members may be added to teams within the final 5 days of the competition or last hour of a hackathon.

I think there is a bug here.If you click the team option and create a dummy team then disband it,all your submissions will be reset to zero.Every time you reach 10 submissions per day,you can keep reseting your submissions to zero :)