To be able to populate team captains you need to make sure the following configurations are set.
  • Ensure that the Include team captains checkbox is checked.
  • Make sure one or both options are checked under the company team affiliation section.
Without "Include company teams" and/or "Include teams with no company affiliation" checked it would prevent any teams from being included in the results which would also prevent any team captains from being found.

If you need more information on creating a Participants task and the connected options then more information can be found here: How to Create a TeamRaiser Participants Task