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We are currently updating a member database with returning and new students/contacts. In the past we have been able to import lists updating the returning students, but now new duplicate records are being created for each of our returning students. I have tried importing using several dedupe rules (including ones that worked in prior years) and also selecting update and skip, but still get duplicates.

What am I missing? Since last year, I have udpated WordPress, CiviCRM and PHP, but I don't know if that could cause this sort of problem. Any suggestions are welcome.

CiviCRM 4.7.31 Wordpress 4.9.6 PHP 7.1

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Easiest way is just to use the Contact ID if it is in your file.

Are you importing to the same location type? It does not dedupe a given data point if importing on a different location type.

I've noticed that you must set your desired dedupe rule to be unsupervised. Selecting a rule that is not marked unsupervised hasn't worked lately and is probably a bug.

I believe this is related Import Contacts with dedupe rules

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  • Changing the rules to unsupervised seemed to do the trick!
    – YOBC
    Commented May 30, 2018 at 17:33

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