A FIO Address consists of a username and a domain delimited by an @ symbol, there are not specific requirements around a FIO Address username, but there are format restrictions around the FIO Address as a whole, and then separate requirements for a FIO Domain in particular

FIO Address (username@domain)FIO Domain
Min. Chars31
Max Chars64 (including FIO Domain)62
Characters allowedASCII a-z 0-9 – (dash) with single @ (at sign)ASCII a-z 0-9 – (dash

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