As you have found out, we only allow registering new accounts with our subdomains (the ones Admin purchased) or a custom domain. I do not know why this is. But after you finish registration, you also have access to all of the other ones (the ones iFastNet owns). Again, I don’t know why it is done this way (I’m sure Admin has an explanation) because it is possible to use any valid subdomain to register. I have a feeling that it is to not overwhelm people who are not very experienced, as a long list of options may stress a lot of people out.
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