Can't filter on E-mail

We have a bounce report from our email blast provider. It only has email addresses. I'd like to run a jet formula against it to find the code, name etc.
NL(,"Customer","E-Mail","No.",B2) returns nothing.
I've tried copying the email fields to notepad and pasting them back into excel with no change.

Is there something I'm missing on why I can't do this on E-Mail (but can on other fields)?

Thank you.


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