Currently in our database, several records are marked as Do Not Synchronize. The issue we are facing is that the wrong duplicate records are flagged (the record which has most info), and now we want to remove this flag from all records in the system.
What are the potential issues we can face if we remove the Do Not Synchronize flag?
You can remove the Do Not Synchronize flag from all records without causing a problem, but there is a potential that doing so will cause duplicates in Luminate Online (which may be the expected/desired result). Additionally, information that has been gathered since the implementation will sync to Luminate Online.
Depending on how much information this is, you might hit your API limit. You can call Salesforce to ask for a one-time increase to complete the sync; Salesforce may or may not charge you for the increase.