Techniques are described for enabling administrators of teams that use a particular service to specify which sign-on options, of multiple possible sign-on options, are assigned to the members of the teams to which the administrators belong. For example, an administrator may assign a first sign-on option, which only allows users to use native authentication, to one set of members of the team. At the same time, the administrator may assign a second sign-on option, which only allows users to use third-party single-sign-on authentication, to another set of members of the same team.