I tested the FTP with a test account and also could not connect with the server you are using. That is because the domain name is not yet pointed to our nameservers. You will need to use your hosting server name in the server field until your domain name is pointed to our nameservers and propagated.
We have an article that shows you how to find your hosting server name to help you.
Use that server name with port 21 and you should be able to connect without issue.
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