There is no limit to the number of admins a team can have on HIGH5. However, at least one person—ideally the creator of the group—must have Full Platform Access (FPA) in order to assign Admin roles to others.
It’s important to understand how Admin roles affect team analytics. Results from users who are Admins only are not included in the Team Report. Since team analytics require at least three Members, anyone whose results should be reflected in the report must have both Admin and Member status.