We need to update the email address of users in All Subscribers, so we used the following aproach:
- Populate a DE with the users to update, saving Subscriber Key and new email address.
- Export the DE to the FTP.
- Import the file to All Subscribers.
Our problem is that it seems that it's using the email to locate the Subscriber instead of trying to refresh it. The report of the importation gives the following error:
0 NotFound [Subscriber Key of the user we were trying to update]
What can be happening here?