I am a freasher in Marketing cloud and don't know how do i manage Unsubscriber for Duplicate records with different SubscriberKey. I will be greatfull if someone can guide me
#Marketing Cloud
If you have duplicate records, that means same emailaddress is associated with multiple subscriber key and if one record unsubscribes then ideally you should update the unsubscribe status for other subscriber keys as well.
To achieve this, you can create an automation, write a query to find out all the records with same email address and then create the data extract, file transfer and import into all subscribers with status as "Unsubscribed".
Another method is use the script activity. You can find more details on this blog created by
@Nobuyuki Watanabe - https://medium.com/@marketingcloudtips/bulk-replacement-of-subscriber-status-for-all-subscribers-using-ssjs-1fe46b3bf4f5Hope this helps!