This can occur for individuals based on records that have very similar Aliases (for example, if Raiser's Edge is integrated with Luminate Online), or if some constituents have a very large number of emails or phone numbers. Try the following in order:
  • Go to Config > Business Rules > Duplicates > Aliases > Unmark Check for individuals.
  • For any constituents with many phones/emails (50 or more), delete any unneeded phones/emails, as these slow processing down for the Duplicate Constituent Management Tool. More information in How to find the number of phone numbers/emails for each constituent