I've reported this problem before. The new interface does not identify who has opted out in the past but is trying to resubscribe. Due to the complexity of your re-subscribe process, we invariably have to hand walk each person through it -- but I can't help them if I don't know which addresses failed!
This problem occurs both on manual pasting of a list of addresses and upload of a spreadsheet. You identify the number that failed, but not who they are.
I don't have the time to search through hundreds of names looking for who didn't make it... please fix this!
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