First, enable the Group Types in Connect 5
  1. Go to Core > Settings > Integration.
  2. Choose Connect 5 Settings.
  3. Click Edit.
  4. Select the group types you wish to include (ex: Community Groups).
  5. Click Save.

Then, enable the Group Page Access that will allow Connect 5 to pull those groups.
  1. Go to onCampus > Settings > Group Page Options.
  2. Select the Group Type (ex: Communities)
  3. Under Integration Options, select Connect 5.