Duplicate contacts - Help please


Hi we are using the api endpoint “http://api.hubapi.com/contacts/v1/contact/batch” to add contacts to hubspot. we are noticing that duplicate contacts are being created with the same email. Does anyone know why and how this is happening? i thought the unique identifier is email… Help please!


Hi @Jonny_Katz,

Would you mind sending some examples of those contacts where you are seeing duplicates created. It should not be possible to create contacts with the same email address so I would like to investigate further.

Feel free to DM me if you don’t want to post links to your contacts publicly.



done. PM. did you receive it?


I did thank you very much, I’m looking into this now.


Just verified this is a bug on our end (thank you for your examples they really helped) A fix should be out to prevent this going forward and the team will be running a merge job to fix the records that have already been created as duplicates. I’ll update here again once that’s done running.


@Jonny_Katz, this merge job should now be complete, let us know if you see any issues related to this


Please let me know which criteria you used to perform the merge. Thanks


The contacts were merged by their email address.