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You'll at least need to unfreeze EX if you want to apply for Amex in the future.
Yes you can ignore it for now but they will require Experian only in the future and there is a good chance they will want the same stuff they asked for this time being your Tax transcripts if you apply in the future as well as something got them curious and they have internal records of previous applicants, etc. So chances are if you apply for any card in the future they will request this again
is that normal for american express to ask for that when opening an account?
@Anonymous wrote:is that normal for american express to ask for that when opening an account?
No, not normal, but it does happen.
I had this problem a couple years ago when doing my app for the PRG. I just started over on the application with the correct ssn and unlocked Experian, approved instantly. Got a letter in the mail for the failed application a week later. You might just want to try starting over with the correct info.