Hello @San-Diego-ASCM ,
Please do not include potentially sensitive contacts' details in the public Community (see Guidelines).
If your first several contacts in your contact file do not have properly formatted email addresses, or are missing their email addresses, the system will reject it. I'd advise checking the email address column for the first several columns to make sure they're meeting the format expectations.
If you're unable to resolve the issue on your own, I'd advise calling general support or replying to the automated @ mention email you receive from my response with the contact file, so we can troubleshoot further.
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