Records that appear in Resolve New Registrations will not be placed into a datasync, this is because the system finds possible duplicates of the record in question and the new record will not sync until that this new registration is resolved.

To Resolve new registrations:
  1. Data Management > Duplicate Management
  2. Select the Resolve New Registrations tab
  3. Search for the constituent
  4. Click Resolve Duplicates, Merge, or Not a Match as needed