Hello @7thGeneration. I see that you were able to chat with our Support team yesterday and they were able to help you out! Just in case another Community member had a similar question, I also wanted to answer your query here.
The error you were seeing during the upload was that some contacts were not uploaded into your account because they did not include email addresses. In order for a contact to be successfully uploaded, they do need to have an email address. You will want to make sure that the correct email address column in your file is selected during the upload process.
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