Dynamics 365 Duplicate Detection Not Working
                     Dynamics 365 
Duplicate 
Detection Not 
Working
1.Introduction
2.Top Reasons and Troubleshooting Steps
3.Conclusion
Introduction
Duplicate detection in Microsoft 
Dynamics 365 plays a critical role in 
maintaining data quality by 
preventing the creation of 
redundant records and ensuring 
accurate reporting and streamlined 
processes, and better customer 
insights. When duplicate detection 
is not working as expected and 
organizations may face issues such 
as inconsistent data, reduced 
system efficiency, and poor user 
experience
Top Reasons and Troubleshooting Steps
Rule is Not Published: Rules must be published to function. Go to 
Advanced Settings > Data Management > Duplicate Detection Rules 
and ensure the rule is published.
Settings Disabled: Ensure the global "Enable duplicate detection" 
setting is checked in Data Management > Duplicate Detection 
Settings.
Data Import/Process Issues: Duplicate detection does not trigger on 
record merges, activations, or during certain bulk updates.
Inactive Record Conflict: If a rule is set to "Exclude inactive records," 
it will not detect duplicates that are already inactive.
Maximum Rule Limit: Only 5 published rules are allowed per entity.
Field Configuration: Ensure the fields used in the rule are populated in 
the records being tested.
API/Service Issues: If using Dataverse search for duplicate detection, 
ensure Dataverse search is enabled in the environment.
Conclusion
Duplicate detection is a vital feature in Microsoft Dynamics 
365 that helps maintain data accuracy and system 
reliability. When duplicate detection is not working, it is 
often due to configuration issues such as disabled rules, 
unpublished changes, missing permissions, or inactive 
duplicate detection settings at the system level.
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