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The error you’re seeing usually happens because AWS expects your mailing list’s "Name" field to match a specific pattern, only letters (a-z, A-Z), numbers (0-9), underscores (_), periods (.), or hyphens (-). It looks like your CSV is missing that Name column, or it contains characters outside that pattern.
Even if you only want to import email addresses, AWS requires each entry to have a valid "Name" field as an identifier. So your CSV should have at least two columns: one named Name (with values matching the allowed pattern, simple usernames or IDs) and one named Address (with the email addresses).
If you want to keep it simple, just create a Name column with simple alphanumeric strings for each email. Avoid spaces or special characters there. Also, make sure your CSV file uses UTF-8 encoding and that headers are exactly spelled as Name and Address (case-sensitive).
So just for clarification, the name field can't have spaces?
Apparently I'm an idiot. Does every address have to have a unique name? I have changed the "name" column to all entries showing "name" as the name. Do I need a unique identifier for each one?