Hi @Sophie van Noort ,
Welcome to our forum!
According to your description, i notice that you are trying to upload a CSV file. As i know, we always use the below two methods:
Upload organizational data (first upload)
Upload organizational data (subsequent upload)
Is it possible to upload extra data information without 'canceling' the data from AD?
Please check if you are using the same method as above. If so, you can try to update existing data.
Hope to help you!
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