Each Raiser's Edge record should have the SphereConstituentIdentifer field on his or her RE record in order to be linked to a Blackbaud Sphere record, or have a Sphere record created through the Connector's bi-directional sync. This solution describes how to add the field to a Raiser's Edge record in order for a Sphere supporter record to be created through a sync or Queried Contact list.
To add the value manually to one record:
Log into Raiser's Edge
Open the constituent record
Go to the Attributes tab
Under the Category column, select SphereConstituentIdentifer
Click Save and Close
Please note, as long as you are sending Contact Updates through a bi-directional sync (This can be seen by going to Control > Administration > Connector Sync: Admin within Sphere. Contact Updates under the Sphere <- Connector column should be marked), a Sphere record will be also be created by adding the category to the record.